--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/client/src/main/webapp/jquery/jquery.digilib.js	Tue Apr 19 18:44:25 2011 +0200
@@ -0,0 +1,1832 @@
+/* Copyright (c) 2011 Martin Raspe, Robert Casties
+ 
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ 
+Authors:
+  Martin Raspe, Robert Casties, 11.1.2011
+*/
+
+/**
+ * digilib jQuery plugin
+**/ 
+
+/*jslint browser: true, debug: true, forin: true
+*/
+
+// fallback for console.log calls
+if (typeof console === 'undefined') {
+    var console = {
+        log : function(){}, 
+        debug : function(){}, 
+        error : function(){}
+        };
+    var customConsole = false; // set to true if debugging for MS IE
+}
+
+(function($) {
+    var buttons = {
+        reference : {
+            onclick : "reference",
+            tooltip : "get a reference URL",
+            icon : "reference.png"
+            },
+        zoomin : {
+            onclick : ["zoomBy", 1.4],
+            tooltip : "zoom in",
+            icon : "zoom-in.png"
+            },
+        zoomout : {
+            onclick : ["zoomBy", 0.7],
+            tooltip : "zoom out",
+            icon : "zoom-out.png"
+            },
+        zoomarea : {
+            onclick : "zoomArea",
+            tooltip : "zoom area",
+            icon : "zoom-area.png"
+            },
+        zoomfull : {
+            onclick : "zoomFull",
+            tooltip : "view the whole image",
+            icon : "zoom-full.png"
+            },
+        pagewidth : {
+            onclick : ["zoomFull", "width"],
+            tooltip : "page width",
+            icon : "pagewidth.png"
+            },
+        back : {
+            onclick : ["gotoPage", "-1"],
+            tooltip : "goto previous image",
+            icon : "back.png"
+            },
+        fwd : {
+            onclick : ["gotoPage", "+1"],
+            tooltip : "goto next image",
+            icon : "fwd.png"
+            },
+        page : {
+            onclick : "gotoPage",
+            tooltip : "goto image number",
+            icon : "page.png"
+            },
+        help : {
+            onclick : "showAboutDiv",
+            tooltip : "about Digilib",
+            icon : "help.png"
+            },
+        reset : {
+            onclick : "reset",
+            tooltip : "reset image",
+            icon : "reset.png"
+            },
+        mark : {
+            onclick : "setMark",
+            tooltip : "set a mark",
+            icon : "mark.png"
+            },
+        delmark : {
+            onclick : "removeMark",
+            tooltip : "delete the last mark",
+            icon : "delmark.png"
+            },
+        hmir : {
+            onclick : ["mirror", "h"],
+            tooltip : "mirror horizontally",
+            icon : "mirror-horizontal.png"
+            },
+        vmir : {
+            onclick : ["mirror", "v"],
+            tooltip : "mirror vertically",
+            icon : "mirror-vertical.png"
+            },
+        rot : {
+            onclick : "rotate",
+            tooltip : "rotate image",
+            icon : "rotate.png"
+            },
+        brgt : {
+            onclick : "brightness",
+            tooltip : "set brightness",
+            icon : "brightness.png"
+            },
+        cont : {
+            onclick : "contrast",
+            tooltip : "set contrast",
+            icon : "contrast.png"
+            },
+        rgb : {
+            onclick : "javascript:setParamWin('rgb', '...')",
+            tooltip : "set rgb values",
+            icon : "rgb.png"
+            },
+        quality : {
+            onclick : "setQuality",
+            tooltip : "set image quality",
+            icon : "quality.png"
+            },
+        size : {
+            onclick : "javascript:toggleSizeMenu()",
+            tooltip : "set page size",
+            icon : "size.png"
+            },
+        calibrationx : {
+            onclick : "calibrate",
+            tooltip : "calibrate screen resolution",
+            icon : "calibration-x.png"
+            },
+        scale : {
+            onclick : "setScaleMode",
+            tooltip : "change image scale",
+            icon : "original-size.png"
+            },
+        toggleoptions : {
+            onclick : "moreButtons",
+            tooltip : "more options",
+            icon : "options.png"
+            },
+        moreoptions : {
+            onclick : ["moreButtons", "+1"],
+            tooltip : "more options",
+            icon : "options.png"
+            },
+        lessoptions : {
+            onclick : ["moreButtons", "-1"],
+            tooltip : "less options",
+            icon : "options.png"
+            },
+        up : {
+            onclick : ["moveZoomArea", 0, -1],
+            tooltip : "move zoom area up",
+            icon : "up.png"
+            },
+        down : {
+            onclick : ["moveZoomArea", 0, 1],
+            tooltip : "move zoom area down",
+            icon : "down.png"
+            },
+        left : {
+            onclick : ["moveZoomArea", -1, 0],
+            tooltip : "move zoom area left",
+            icon : "left.png"
+            },
+        right : {
+            onclick : ["moveZoomArea", 1, 0],
+            tooltip : "move zoom area right",
+            icon : "right.png"
+            },
+        SEP : {
+            icon : "sep.png"
+            }
+        };
+
+    var defaults = {
+        // version of this script
+        'version' : 'jquery.digilib.js 0.9',
+        // logo url
+        'logoUrl' : '../img/digilib-logo-text1.png',
+        // homepage url (behind logo)
+        'homeUrl' : 'http://digilib.berlios.de',
+        // base URL to digilib viewer (for reference URLs)
+        'digilibBaseUrl' : null,
+        // base URL to Scaler servlet
+        'scalerBaseUrl' : null,
+        // list of Scaler parameters
+        'scalerParamNames' : ['fn','pn','dw','dh','ww','wh','wx','wy','ws','mo',
+                              'rot','cont','brgt','rgbm','rgba','ddpi','ddpix','ddpiy'],
+        // Scaler parameter defaults
+        'pn' : 1,
+        'ww' : 1.0,
+        'wh' : 1.0,
+        'wx' : 0.0,
+        'wy' : 0.0,
+        'ws' : 1.0,
+        'mo' : '',
+        'rot' : 0,
+        'cont' : 0,
+        'brgt' : 0,
+        'rgbm' : '0/0/0',
+        'rgba' : '0/0/0',
+        'ddpi' : null,
+        'ddpix' : null,
+        'ddpiy' : null,
+        // list of digilib parameters
+        'digilibParamNames' : ['fn','pn','ww','wh','wx','wy','ws','mo','rot','cont','brgt','rgbm','rgba','ddpi','mk','clop'],
+        // digilib parameter defaults
+        'mk' : '',
+        'clop' : '',
+        // mode of operation: 
+        // fullscreen = take parameters from page URL, keep state in page URL
+        // embedded = take parameters from Javascript options, keep state inside object 
+        'interactionMode' : 'fullscreen',
+        // buttons
+        'buttons' : buttons,
+        // defaults for digilib buttons
+        'buttonSettings' : {
+            'fullscreen' : {
+                // path to button images (must end with a slash)
+                'imagePath' : 'img/fullscreen/',
+                'buttonSetWidth' : 36,
+                'standardSet' : ["reference","zoomin","zoomout","zoomarea","zoomfull","pagewidth","back","fwd","page","help","reset","toggleoptions"],
+                'specialSet' : ["mark","delmark","hmir","vmir","rot","brgt","cont","rgb","quality","size","calibrationx","scale","lessoptions"],
+                'arrowSet' : ["up", "down", "left", "right"],
+                'buttonSets' : ['standardSet', 'specialSet']
+                },
+            'embedded' : {
+                'imagePath' : 'img/embedded/16/',
+                'buttonSetWidth' : 18,
+                'standardSet' : ["reference","zoomin","zoomout","zoomarea","zoomfull","help","reset","toggleoptions"],
+                'specialSet' : ["mark","delmark","hmir","vmir","rot","brgt","cont","rgb","quality","scale","lessoptions"],
+                'arrowSet' : ["up", "down", "left", "right"],
+                'buttonSets' : ['standardSet', 'specialSet']
+                },
+        },
+        // arrow bar overlays for moving the zoomed area
+        'showZoomArrows' : true,
+        // zoom arrow bar minimal width (for small images)
+        'zoomArrowMinWidth' : 6,
+        // zoom arrow bar standard width
+        'zoomArrowWidth' : 32,
+        // by what percentage should the arrows move the zoomed area?
+        'zoomArrowMoveFactor' : 0.5,
+        // number of visible button groups
+        'visibleButtonSets' : 1,
+        // is the "about" window shown?
+        'isAboutDivVisible' : false,
+        // default size of background image for drag-scroll (same as Bird's Eye View image)
+        'bgImgWidth' : 200,
+        'bgImgHeight' : 200,
+        // maximum width or height of background image for drag-scroll
+        'maxBgSize' : 10000,
+        // parameters used by background image
+        'bgImgParams' : ['fn','pn','dw','dh','mo','rot'],
+        // reserved space in full page display (default value accounts for vertical scrollbar)
+        'scalerInset' : 10
+        };
+
+    // list of plugins
+    var plugins = {};
+    // object to export functions to plugins
+    var fn;
+    // affine geometry plugin stub
+    var geom;
+
+    var FULL_AREA;
+
+    var actions = {
+        // init: digilib initialization
+        init : function(options) {
+            // import geometry classes
+            if (plugins.geometry == null) {
+                $.error("jquery.digilib.geometry plugin not found!");
+                // last straw: old version
+                geom = dlGeometry();
+            } else {
+                // geometry plugin puts classes in the shared fn
+                geom = fn.geometry;
+            }
+            FULL_AREA  = geom.rectangle(0, 0, 1, 1);
+
+            // settings for this digilib instance are merged from defaults and options
+            var settings = $.extend({}, defaults, options);
+            var isFullscreen = settings.interactionMode === 'fullscreen';
+            var queryParams = {};
+            if (isFullscreen) {
+                queryParams = parseQueryParams();
+                // check scalerBaseUrl
+                if (settings.scalerBaseUrl == null) {
+                    // try the host this came from
+                    var h = window.location.host;
+                    if (window.location.host) {
+                        var url = window.location.href;
+                        // assume the page lives in [webapp]/jquery/
+                        var pos = url.indexOf('jquery/');
+                        if (pos > 0) {
+                            settings.scalerBaseUrl = url.substring(0, pos) + 'servlet/Scaler';
+                        }
+                    }
+                }
+            }
+            return this.each(function() {
+                var $elem = $(this);
+                var data = $elem.data('digilib');
+                var params, elemSettings;
+                // if the plugin hasn't been initialized yet
+                if (!data) {
+                    // merge query parameters
+                    if (isFullscreen) {
+                        params = queryParams;
+                    } else {
+                        params = parseImgParams($elem);
+                        if ($.cookie) {
+                            // retrieve params from cookie
+                            var ck = "digilib-embed:fn:" + escape(params.fn) + ":pn:" + (params.pn || '1');
+                            var cs = $.cookie(ck);
+                            console.debug("get cookie=", ck, " value=", cs);
+                            if (cs) {
+                                var cp = parseQueryString(cs);
+                                // ignore fn and pn from cookie TODO: should we keep pn?
+                                delete cp.fn;
+                                delete cp.pn;
+                                $.extend(params, cp);
+                            }
+                        }
+                    }
+                    // setup $elem.data, needs "deep copy" because of nesting
+                    elemSettings = $.extend(true, {}, settings, params);
+                    data = {
+                            // let $(this) know about $(this) :-)
+                            $elem : $elem,
+                            // let $elem have its own copy of settings
+                            settings : elemSettings,
+                            // and of the URL query parameters
+                            queryParams : params,
+                            // TODO: move plugins reference out of data
+                            plugins : plugins
+                    };
+                    // store in jQuery data element
+                    $elem.data('digilib', data);
+                }
+                unpackParams(data);
+                // check if browser knows *background-size
+                for (var bs in {'':1, '-moz-':1, '-webkit-':1, '-o-':1}) {
+                    if ($elem.css(bs+'background-size')) {
+                        data.hasBgSize = true;
+                        data.bgSizeName = bs+'background-size';
+                        break;
+                    }
+                }
+                // check digilib base URL
+                if (elemSettings.digilibBaseUrl == null) {
+                    if (isFullscreen) {
+                        // take current host
+                        var url = window.location.toString();
+                        var pos = url.indexOf('?');
+                        elemSettings.digilibBaseUrl = url.substring(0, pos);
+                    } else {
+                        var url = elemSettings.scalerBaseUrl;
+                        if (url) {
+                            // build it from scaler URL
+                            var bp = url.indexOf('/servlet/Scaler');
+                            elemSettings.digilibBaseUrl = url.substring(0, bp) + '/digilib.jsp';
+                        }
+                    }
+                }
+                // initialise plugins
+                for (n in plugins) {
+                    var p = plugins[n];
+                    if (typeof p.init === 'function') {
+                        p.init(data);
+                    }
+                }
+                // get image info from server if needed
+                if (data.scaleMode === 'pixel' || data.scaleMode === 'size') {
+                    $(data).bind('imageInfo', handleImageInfo);
+                    loadImageInfo(data); // triggers "imageInfo" on completion
+                }
+                // create buttons before scaler 
+                for (var i = 0; i < elemSettings.visibleButtonSets; ++i) {
+                    showButtons(data, true, i);
+                    }
+                // create HTML structure for scaler, taking width of buttons div into account
+                setupScalerDiv(data);
+                highlightButtons(data);
+                // about window creation - TODO: could be deferred? restrict to only one item?
+                setupAboutDiv(data);
+                // arrow overlays for moving zoomed detail
+                setupZoomArrows(data);
+                // send setup event
+                $(data).trigger('setup');
+            });
+        },
+
+        // destroy: clean up digilib
+        destroy : function(data) {
+            return this.each(function(){
+                var $elem = $(this);
+                $(window).unbind('.digilib'); // unbind all digilibs(?)
+                data.digilib.remove();
+                $elem.removeData('digilib');
+            });
+        },
+
+        // show or hide the 'about' window
+        showAboutDiv : function(data, show) {
+            var on = showDiv(data.settings.isAboutDivVisible, data.$aboutDiv, show);
+            data.settings.isAboutDivVisible = on;
+            highlightButtons(data, 'help', on);
+        },
+
+        // goto given page nr (+/-: relative)
+        gotoPage : function (data, pageNr) {
+            var settings = data.settings;
+            var oldpn = settings.pn;
+            if (pageNr == null) {
+                pageNr = window.prompt("Goto page number", oldpn);
+            }
+            var pn = setNumValue(settings, "pn", pageNr);
+            if (pn == null) return false; // nothing happened
+            if (pn < 1) {
+                alert("no such page (page number too low)");
+                settings.pn = oldpn;
+                return false;
+                }
+            // TODO: how do we get pt?
+            if (settings.pt) {
+                if (pn > settings.pt) {
+                    alert("no such page (page number too high)");
+                    settings.pn = oldpn;
+                    return false;
+                    }
+                }
+            // reset mk and others(?)
+            data.marks = [];
+            data.zoomArea = FULL_AREA;
+            // then reload
+            redisplay(data);
+        },
+
+        // zoom by a given factor
+        zoomBy : function (data, factor) {
+            zoomBy(data, factor);
+        },
+
+        // zoom to area (or interactive)
+        zoomArea : function (data, area) {
+            var settings = data.settings;
+            if (area == null) {
+                // interactively
+                zoomArea(data);
+            } else {
+                data.zoomArea = geom.rectangle(area);
+                redisplay(data);
+            }
+        },
+
+        // zoom out to full page
+        zoomFull : function (data, mode) {
+            data.zoomArea = FULL_AREA;
+            if (mode === 'width') {
+                data.dlOpts.fitwidth = 1;
+                delete data.dlOpts.fitheight;
+            } else if (mode === 'height') {
+                data.dlOpts.fitheight = 1;
+                delete data.dlOpts.fitwidth;
+            } else {
+                delete data.dlOpts.fitwidth;
+                delete data.dlOpts.fitheight;
+            }
+            redisplay(data);
+        },
+
+        // move zoomed area
+        moveZoomArea : function (data, dx, dy) {
+            var za = data.zoomArea;
+            var factor = data.settings.zoomArrowMoveFactor;
+            var deltaX = dx * factor * za.width;
+            var deltaY = dy * factor * za.height;
+            za.addPosition(geom.position(deltaX, deltaY));
+            data.zoomArea = FULL_AREA.fit(za);
+            redisplay(data);
+        },
+
+        // set a mark by clicking (or giving a position)
+        setMark : function (data, mpos) {
+            if (mpos == null) {
+                // interactive
+                setMark(data);
+            } else {
+                // use position
+                data.marks.push(pos);
+                redisplay(data);
+            }
+        },
+
+        // remove the last mark
+        removeMark : function (data) {
+            data.marks.pop();
+            redisplay(data);
+        },
+
+        // mirror the image
+        mirror : function (data, mode) {
+            var flags = data.scalerFlags;
+            if (mode === 'h') {
+                if (flags.hmir) {
+                    delete flags.hmir;
+                } else {
+                    flags.hmir = 1;
+                }
+            } else {
+                if (flags.vmir) {
+                    delete flags.vmir;
+                } else {
+                    flags.vmir = 1;
+                }
+            }
+            redisplay(data);
+        },
+
+        // rotate the image
+        rotate : function (data, angle) {
+            var rot = data.settings.rot;
+            if (angle == null) {
+                angle = window.prompt("Rotation angle:", rot);
+            }
+            data.settings.rot = angle;
+            redisplay(data);
+        },
+
+        // change brightness
+        brightness : function (data, factor) {
+            var brgt = data.settings.brgt;
+            if (factor == null) {
+                factor = window.prompt("Brightness (-255..255)", brgt);
+            }
+            data.settings.brgt = factor;
+            redisplay(data);
+        },
+
+        // change contrast
+        contrast : function (data, factor) {
+            var cont = data.settings.cont;
+            if (factor == null) {
+                factor = window.prompt("Contrast (-8, 8)", cont);
+            }
+            data.settings.cont = factor;
+            redisplay(data);
+        },
+
+        // display more (or less) button sets
+        moreButtons : function (data, more) {
+            var settings = data.settings;
+            if (more == null) {
+                // toggle more or less (only works for 2 sets)
+                var maxbtns = settings.buttonSettings[settings.interactionMode].buttonSets.length;
+                if (settings.visibleButtonSets >= maxbtns) {
+                    more = '-1';
+                } else {
+                    more = '+1';
+                }
+            }
+            if (more === '-1') {
+                // remove set
+                var setIdx = settings.visibleButtonSets - 1;
+                if (showButtons(data, false, setIdx, true)) {
+                    settings.visibleButtonSets--;
+                }
+            } else {
+                // add set
+                var setIdx = settings.visibleButtonSets;
+                if (showButtons(data, true, setIdx, true)) {
+                    settings.visibleButtonSets++;
+                }
+            }
+            // persist setting
+            storeOptions(data);
+        },
+
+        // reset image parameters to defaults
+        reset : function (data) {
+            var settings = data.settings;
+            var paramNames = settings.digilibParamNames;
+            var params = data.queryParams;
+            // delete all digilib parameters
+            for (var i = 0; i < paramNames.length; i++) {
+                var paramName = paramNames[i];
+                delete settings[paramName];
+                }
+            settings.fn = params.fn || ''; // no default defined
+            settings.pn = params.pn || defaults.pn;
+            settings.dw = params.dw;
+            settings.dh = params.dh;
+            settings.isBirdDivVisible = false;
+            settings.visibleButtonSets = 1;
+            // resets zoomArea, marks, scalerflags
+            data.zoomArea = FULL_AREA;
+            data.marks = [];
+            data.scalerFlags = {};
+            delete data.dlOpts.fitwidth;
+            delete data.dlOpts.fitheight;
+            redisplay(data);
+        },
+
+        // presents a reference url (returns value if noprompt)
+        reference : function (data, noprompt) {
+            var settings = data.settings;
+            var url = getDigilibUrl(data);
+            if (noprompt == null) {
+                window.prompt("URL reference to the current view", url);
+            }
+            return url;
+        },
+
+        // set image quality
+        setQuality : function (data, qual) {
+            var oldq = getQuality(data);
+            if (qual == null) {
+                qual = window.prompt("Image quality (0..2)", oldq);
+            }
+            qual = parseInt(qual, 10);
+            if (qual >= 0 && qual <= 2) {
+                setQuality(data, qual);
+                redisplay(data);
+            }
+        },
+
+        // calibrate (only faking)
+        calibrate : function (data, res) {
+            var oldRes = data.settings.ddpi;
+            if (res == null) {
+                res = window.prompt("Display resolution (dpi)", oldRes);
+            }
+            if (res != null) {
+                data.settings.ddpi = res;
+                redisplay(data);
+            }
+        },
+
+        // set image scale mode
+        setScaleMode : function (data, mode) {
+            var oldM = getScaleMode(data);
+            if (mode == null) {
+                mode = window.prompt("Image scale mode (screen, pixel, size)", oldM);
+            }
+            if (mode != null) {
+                setScaleMode(data, mode);
+                data.scaleMode = mode;
+                redisplay(data);
+            }
+        }
+
+    // end of actions
+    };
+
+    // returns parameters from page url
+    var parseQueryParams = function() {
+        return parseQueryString(window.location.search.slice(1));
+    };
+
+    // returns parameters from embedded img-element
+    var parseImgParams = function($elem) {
+        var src = $elem.find('img').first().attr('src');
+        if (!src) return null;
+        var pos = src.indexOf('?');
+        var query = (pos < 0) ? '' : src.substring(pos + 1);
+        var scalerUrl = src.substring(0, pos);
+        var params = parseQueryString(query);
+        params.scalerBaseUrl = scalerUrl;
+        return params;
+    };
+
+    // parses query parameter string into parameter object
+    var parseQueryString = function(query) {
+        var params = {};
+        if (query == null) return params;
+        var pairs = query.split("&");
+        //var keys = [];
+        for (var i = 0; i < pairs.length; i++) {
+            var pair = pairs[i].split("=");
+            if (pair.length === 2) {
+                params[pair[0]] = pair[1];
+                //keys.push(pair[0]);
+            }
+        }
+        return params;
+    };
+
+    // returns a query string from key names from a parameter hash (ignoring if the same value is in defaults)
+    var getParamString = function (settings, keys, defaults) {
+        var paramString = '';
+        var nx = false;
+        for (i = 0; i < keys.length; ++i) {
+            var key = keys[i];
+            if ((settings[key] != null) && ((defaults == null) || (settings[key] != defaults[key]))) {
+                // first param gets no '&'
+                if (nx) {
+                    paramString += '&';
+                } else {
+                    nx = true;
+                }
+                // add parm=val
+                paramString += key + '=' + settings[key];
+            }
+        }
+        return paramString;
+    };
+
+    // returns URL and query string for Scaler
+    var getScalerUrl = function (data) {
+        packParams(data);
+        var settings = data.settings;
+        if (settings.scalerBaseUrl == null) {
+            alert("ERROR: URL of digilib Scaler servlet missing!");
+            }
+        var keys = settings.scalerParamNames;
+        var queryString = getParamString(settings, keys, defaults);
+        var url = settings.scalerBaseUrl + '?' + queryString;
+        return url;
+    };
+
+    // returns URL for bird's eye view image
+    var getBgImgUrl = function (data, moreParams) {
+        var settings = data.settings;
+        var bgOptions = {
+                dw : settings.bgImgWidth,
+                dh : settings.bgImgHeight
+        };
+        var bgSettings = $.extend({}, settings, bgOptions);
+        // filter scaler flags
+        if (bgSettings.mo != null) {
+            var mo = '';
+            if (data.scalerFlags.hmir != null) {
+                mo += 'hmir,';
+            }
+            if (data.scalerFlags.vmir != null) {
+                mo += 'vmir';
+            }
+            bgSettings.mo = mo;
+        }
+        var params = getParamString(bgSettings, settings.bgImgParams, defaults);
+        var url = settings.scalerBaseUrl + '?' + params;
+        return url;
+    };
+
+    // returns URL and query string for current digilib
+    var getDigilibUrl = function (data) {
+        packParams(data);
+        var settings = data.settings;
+        var queryString = getParamString(settings, settings.digilibParamNames, defaults);
+        return settings.digilibBaseUrl + '?' + queryString;
+    };
+
+    // loads image information from digilib server via HTTP
+    var loadImageInfo = function (data) {
+        var settings = data.settings;
+        var p = settings.scalerBaseUrl.indexOf('/servlet/Scaler');
+        var url = settings.scalerBaseUrl.substring(0, p) + '/ImgInfo-json.jsp';
+        url += '?' + getParamString(settings, ['fn', 'pn'], defaults);
+        // TODO: better error handling
+        $.getJSON(url, function (json) {
+            console.debug("got json data=", json);
+            data.imgInfo = json;
+            // send event
+            $(data).trigger('imageInfo', [json]);
+        });
+    };
+
+    // processes some parameters into objects and stuff
+    var unpackParams = function (data) {
+        var settings = data.settings;
+        // zoom area
+        var zoomArea = geom.rectangle(settings.wx, settings.wy, settings.ww, settings.wh);
+        data.zoomArea = zoomArea;
+        // marks
+        var marks = [];
+        if (settings.mk) {
+            var mk = settings.mk;
+            if (mk.indexOf(";") >= 0) {
+                var pa = mk.split(";");    // old format with ";"
+            } else {
+                var pa = mk.split(",");    // new format
+            }
+            for (var i = 0; i < pa.length ; i++) {
+                var pos = pa[i].split("/");
+                if (pos.length > 1) {
+                    marks.push(geom.position(pos[0], pos[1]));
+                    }
+                }
+            }
+        data.marks = marks;
+        // mo (Scaler flags)
+        var flags = {};
+        if (settings.mo) {
+            var pa = settings.mo.split(",");
+            for (var i = 0; i < pa.length ; i++) {
+                flags[pa[i]] = pa[i];
+                }
+            }
+        data.scalerFlags = flags;
+        data.scaleMode = getScaleMode(data);
+        retrieveOptions(data);
+    };
+
+    // put area into parameters
+    var packArea = function (settings, area) {
+        if (!area) return;
+        // zoom area
+        settings.wx = cropFloat(area.x);
+        settings.wy = cropFloat(area.y);
+        settings.ww = cropFloat(area.width);
+        settings.wh = cropFloat(area.height);
+    };
+
+    // put marks into parameters
+    var packMarks = function (settings, marks) {
+        if (!marks) return;
+        settings.mk = '';
+        for (var i = 0; i < marks.length; i++) {
+            if (i) {
+                settings.mk += ',';
+                }
+            settings.mk +=
+                cropFloatStr(marks[i].x) + '/' + 
+                cropFloatStr(marks[i].y);
+            }
+    };
+
+    // pack scaler flags into parameters
+    var packScalerFlags = function (settings, flags) {
+        if (!flags) return;
+        var mo = '';
+        for (var f in flags) {
+            if (mo) {
+                mo += ',';
+            }
+            mo += f;
+        }
+        settings.mo = mo;
+    };
+
+    // put objects back into parameters
+    var packParams = function (data) {
+        var settings = data.settings;
+        packArea(settings, data.zoomArea);
+        packMarks(settings, data.marks);
+        packScalerFlags(settings, data.scalerFlags);
+        // store user interface options in cookie
+        storeOptions(data);
+    };
+
+    var storeOptions = function (data) {
+        // save digilib options in cookie
+        var settings = data.settings;
+        if (data.dlOpts) {
+            // save digilib settings in options
+            data.dlOpts.birdview = settings.isBirdDivVisible ? 1 : 0;
+            data.dlOpts.buttons = settings.visibleButtonSets;
+            var clop = '';
+            for (var o in data.dlOpts) {
+                if (clop) {
+                    clop += '&';
+                    }
+                clop += o + '=' + data.dlOpts[o];
+                }
+            if ($.cookie) {
+                var ck = "digilib:fn:" + escape(settings.fn) + ":pn:" + settings.pn;
+                console.debug("set cookie=", ck, " value=", clop);
+                $.cookie(ck, clop);
+                }
+        }
+        if (settings.interactionMode !== 'fullscreen' && $.cookie) {
+            // store normal parameters in cookie for embedded mode
+            var qs = getParamString(settings, settings.digilibParamNames, defaults);
+            var ck = "digilib-embed:fn:" + escape(settings.fn) + ":pn:" + settings.pn;
+            console.debug("set cookie=", ck, " value=", qs);
+            $.cookie(ck, qs);
+        }
+    };
+
+    var retrieveOptions = function (data) {
+        // clop (digilib options)
+        var opts = {};
+        var settings = data.settings;
+        if ($.cookie) {
+            // read from cookie
+            var ck = "digilib:fn:" + escape(settings.fn) + ":pn:" + settings.pn;
+            var cp = $.cookie(ck);
+            console.debug("get cookie=", ck, " value=", cp);
+            // in query string format
+            opts = parseQueryString(cp);
+            }
+        data.dlOpts = opts;
+        // birdview option
+        if (opts.birdview != null) {
+            settings.isBirdDivVisible = opts.birdview === '1';
+            }
+        // visible button sets
+        if (opts.buttons != null) {
+            settings.visibleButtonSets = opts.buttons;
+            }
+    };
+
+    // (re)load the img from a new scaler URL
+    var redisplay = function (data) {
+        var settings = data.settings; 
+        if (settings.interactionMode === 'fullscreen') {
+            // update location.href (browser URL) in fullscreen mode
+            var url = getDigilibUrl(data);
+            var history = window.history;
+            if (typeof history.pushState === 'function') {
+                console.debug("faking reload to "+url);
+                // change url without reloading (stateObj, title, url)
+                // TODO: we really need to push the state in stateObj and listen to pop-events
+                history.replaceState({}, '', url);
+                // change img src
+                var imgurl = getScalerUrl(data);
+                data.$img.attr('src', imgurl);
+                highlightButtons(data);
+                // send event
+                $(data).trigger('redisplay');
+            } else {
+                // reload window
+                window.location = url;
+            }
+        } else {
+            // embedded mode -- just change img src
+            var url = getScalerUrl(data);
+            data.$img.attr('src', url);
+            highlightButtons(data);
+            // send event
+            $(data).trigger('redisplay');
+            }
+    };
+
+    // update display (overlays etc.)
+    var updateDisplay = function (data) {
+        updateImgTrafo(data);
+        renderMarks(data);
+        setupZoomDrag(data);
+        renderZoomArrows(data);
+        // send event
+        $(data).trigger('update');
+    };
+
+    // returns maximum size for scaler img in fullscreen mode
+    var getFullscreenImgSize = function (data) {
+        var mode = data.settings.interactionMode;
+        var $win = $(window);
+        var winH = $win.height();
+        var winW = $win.width();
+        var $body = $('body');
+        // include standard body margins and check plausibility
+        var borderW = $body.outerWidth(true) - $body.width();
+        if (borderW === 0 || borderW > 100) {
+            console.debug("fixing border width for getFullscreenImgSize!");
+            borderW = data.settings.scalerInset;
+        }
+        var borderH = $body.outerHeight(true) - $body.height();
+        if (borderH === 0 || borderH > 100) {
+            console.debug("fixing border height for getFullscreenImgSize!");
+            borderH = 5;
+        }
+        var buttonsW = 0; 
+        if (data.settings.visibleButtonSets) {
+            // get button width from settings
+            buttonsW = data.settings.buttonSettings[mode].buttonSetWidth;
+            // TODO: leave space for all button sets?
+        }
+        // account for left/right border, body margins and additional requirements
+        var imgW = winW - borderW - buttonsW;
+        var imgH = winH - borderH;
+        console.debug(winW, winH, 'winW:', $win.width(), 'border:', borderW, 'buttonsW:', buttonsW, 'calc:', imgW);
+        return geom.size(imgW, imgH);
+    };
+
+    // creates HTML structure for digilib in elem
+    var setupScalerDiv = function (data) {
+        var settings = data.settings;
+        var $elem = data.$elem;
+        $elem.addClass('digilib');
+        var $img;
+        var scalerUrl;
+        if (settings.interactionMode === 'fullscreen') {
+            // fullscreen
+            $elem.addClass('dl_fullscreen');
+            var imgSize = getFullscreenImgSize(data);
+            // fitwidth/height omits destination height/width
+            if (data.dlOpts.fitheight == null) {
+                settings.dw = imgSize.width;
+            }
+            if (data.dlOpts.fitwidth == null) {
+                settings.dh = imgSize.height;
+            }
+            scalerUrl = getScalerUrl(data);
+            $img = $('<img/>');
+        } else {
+            // embedded mode -- try to keep img tag
+            $elem.addClass('dl_embedded');
+            scalerUrl = getScalerUrl(data);
+            $img = $elem.find('img');
+            if ($img.length > 0) {
+                var oldUrl = $img.attr('src');
+                // keep img attributes from html
+                var title = $img.attr('title');
+                var alt = $img.attr('alt');
+                if (oldUrl === scalerUrl) {
+                    console.debug("img detach:", $img);
+                    $img.detach();
+                } else {
+                    $img = $('<img/>');
+                    $img.attr("title", title);
+                    $img.attr("alt", alt);
+                }
+            } else {
+                $img = $('<img/>');
+            }
+        }
+        // create new inner html, keeping buttons and content marked with "keep" class
+        $elem.contents(":not(.keep)").remove();
+        var $scaler = $('<div class="scaler"/>');
+        // scaler should be the first child element?
+        $elem.prepend($scaler);
+        $scaler.append($img);
+        $img.addClass('pic');
+        data.$scaler = $scaler;
+        data.$img = $img;
+        // setup image load handler before setting the src attribute (IE bug)
+        $img.load(scalerImgLoadedHandler(data));
+        $img.error(function () {console.error("error loading scaler image");});
+        $img.attr('src', scalerUrl);
+    };
+
+    // creates HTML structure for a single button
+    var createButton = function (data, $div, buttonName) {
+        var $elem = data.$elem;
+        var settings = data.settings;
+        var mode = settings.interactionMode;
+        var imagePath = settings.buttonSettings[mode].imagePath;
+        var buttonConfig = settings.buttons[buttonName];
+        // button properties
+        var action = buttonConfig.onclick;
+        var tooltip = buttonConfig.tooltip;
+        var icon = imagePath + buttonConfig.icon;
+        // construct the button html
+        var $button = $('<div class="button"></div>');
+        var $a = $('<a/>');
+        var $img = $('<img class="button"/>');
+        $div.append($button);
+        $button.append($a);
+        $a.append($img);
+        // add attributes and bindings
+        $button.attr('title', tooltip);
+        $button.addClass('button-' + buttonName);
+        $img.attr('src', icon);
+        // create handler for the buttons
+        $button.bind('click.digilib', (function () {
+            // we create a new closure to capture the value of action
+            if ($.isArray(action)) {
+                // the handler function calls digilib with action and parameters
+                return function (evt) {
+                    console.debug('click action=', action, ' evt=', evt);
+                    $elem.digilib.apply($elem, action);
+                    return false;
+                };
+            } else {
+                // the handler function calls digilib with action
+                return function (evt) {
+                    console.debug('click action=', action, ' evt=', evt);
+                    $elem.digilib(action);
+                    return false;
+                };
+            }
+        })());
+    };
+
+    // creates HTML structure for buttons in elem
+    var createButtons = function (data, buttonSetIdx) {
+        var $elem = data.$elem;
+        var settings = data.settings;
+        var mode = settings.interactionMode;
+        var buttonSettings = settings.buttonSettings[mode];
+        var buttonGroup = buttonSettings.buttonSets[buttonSetIdx];
+        if (buttonGroup == null) {
+            // no buttons here
+            return;
+        }
+        // button divs are marked with class "keep"
+        var $buttonsDiv = $('<div class="keep buttons"/>');
+        var buttonNames = buttonSettings[buttonGroup];
+        for (var i = 0; i < buttonNames.length; i++) {
+            var buttonName = buttonNames[i];
+            createButton(data, $buttonsDiv, buttonName);
+        }
+        // make buttons div scroll if too large for window
+        if ($buttonsDiv.height() > $(window).height() - 10) {
+            $buttonsDiv.css('position', 'absolute');
+        }
+        // buttons hidden at first
+        $buttonsDiv.hide();
+        $elem.append($buttonsDiv);
+        if (data.$buttonSets == null) {
+            // first button set
+            data.$buttonSets = [$buttonsDiv];
+        } else {
+            $elem.append($buttonsDiv);
+            data.$buttonSets[buttonSetIdx] = $buttonsDiv;
+        }
+        return $buttonsDiv;
+    };
+
+    // creates arrow overlays for moving the zoomed area
+    var setupZoomArrows = function (data) {
+        var $elem = data.$elem;
+        var settings = data.settings;
+        var show = settings.showZoomArrows;
+        console.log('zoom arrows:', show);
+        if (!show) return;
+        var mode = settings.interactionMode;
+        var arrowNames = settings.buttonSettings[mode].arrowSet;
+        if (arrowNames == null) return;
+        // arrow divs are marked with class "keep"
+        var $arrowsDiv = $('<div class="keep arrows"/>');
+        $elem.append($arrowsDiv);
+        // create all arrow buttons
+        $.each(arrowNames, function(i, arrowName){
+            createButton(data, $arrowsDiv, arrowName);
+            });
+    };
+
+    // size and show arrow overlays, called after scaler img is loaded
+    var renderZoomArrows = function (data) {
+        var settings = data.settings;
+        var $arrowsDiv = data.$elem.find('div.arrows');
+        if (isFullArea(data.zoomArea) || !settings.showZoomArrows) {
+            $arrowsDiv.hide();
+            return;
+            }
+        $arrowsDiv.show();
+        var r = geom.rectangle(data.$scaler);
+        // calculate arrow bar width
+        var aw = settings.zoomArrowWidth;
+        var minWidth = settings.zoomArrowMinWidth;
+        // arrow bar width should not exceed 10% of scaler width/height
+        var maxWidth = Math.min(r.width, r.height)/10;
+        if (aw > maxWidth) {
+            aw = maxWidth;
+            if (aw < minWidth) {
+                aw = minWidth;
+            }
+        }
+        // vertical position of left/right image
+        var arrowData = [{
+            name : 'up',
+            rect : geom.rectangle(r.x, r.y, r.width, aw), 
+            show : canMove(data, 0, -1)
+        }, {
+            name : 'down',
+            rect : geom.rectangle(r.x, r.y + r.height - aw, r.width, aw),
+            show : canMove(data, 0, 1)
+        }, {
+            name : 'left',
+            rect : geom.rectangle(r.x, r.y, aw, r.height),
+            show : canMove(data, -1, 0)
+        }, {
+            name : 'right',
+            rect : geom.rectangle(r.x + r.width - aw, r.y, aw, r.height),
+            show : canMove(data, 1, 0)
+        }];
+        // render a single zoom Arrow
+        var render = function (i, item) {
+            var $arrow = $arrowsDiv.find('div.button-' + item.name);
+            if (item.show) {
+                $arrow.show();
+            } else {
+                $arrow.hide();
+                return;
+            }
+            var r = item.rect; 
+            r.adjustDiv($arrow);
+            var $a = $arrow.contents('a');
+            var $img = $a.contents('img');
+            $img.width(aw).height(aw);
+            // hack for missing vertical-align
+            if (item.name.match(/left|right/)) {
+                var top = (r.height - $a.height())/2;
+                $a.css({'top' : top}); // position : 'relative'
+                }
+        };
+        $.each(arrowData, render);
+    };
+
+    // creates HTML structure for the about view in elem
+    var setupAboutDiv = function (data) {
+        var $elem = data.$elem;
+        var settings = data.settings;
+        var $aboutDiv = $('<div class="about" style="display:none"/>');
+        var $header = $('<p>Digilib Image Viewer</p>');
+        var $link = $('<a/>');
+        var $logo = $('<img class="logo" title="digilib"/>');
+        var $content = $('<p/>');
+        $elem.append($aboutDiv);
+        $aboutDiv.append($header);
+        $aboutDiv.append($link);
+        $aboutDiv.append($content);
+        $link.append($logo);
+        $logo.attr('src', settings.logoUrl);
+        $link.attr('href', settings.homeUrl);
+        $content.text('Version: ' + settings.version);
+        data.$aboutDiv = $aboutDiv;
+        // click hides
+        $aboutDiv.bind('click.digilib', function () {
+            actions['showAboutDiv'](data, false);
+            });
+    };
+
+    // shows some window e.g. 'about' (toggle visibility if show is null)
+    var showDiv = function (isVisible, $div, show) {
+        if (show == null) {
+            // toggle visibility
+            isVisible = !isVisible;
+        } else {
+            // set visibility
+            isVisible = show;
+            }
+        if (isVisible) {
+            $div.fadeIn();
+        } else {
+            $div.fadeOut();
+            }
+        return isVisible;
+    };
+
+    // display more (or less) button sets
+    var showButtons = function (data, more, setIdx, animated) {
+        var atime = animated ? 'fast': 0;
+        // get button width from settings
+        var mode = data.settings.interactionMode;
+        var btnWidth = data.settings.buttonSettings[mode].buttonSetWidth;
+        if (more) {
+            // add set
+            var $otherSets = data.$elem.find('div.buttons:visible');
+            var $set;
+            if (data.$buttonSets && data.$buttonSets[setIdx]) {
+                // set exists
+                $set = data.$buttonSets[setIdx];
+            } else {
+                $set = createButtons(data, setIdx);
+                }
+            if ($set == null) return false;
+            // include border in calculation
+            //var btnWidth = $set.outerWidth();
+            // console.debug("btnWidth", btnWidth);
+            // move remaining sets left and show new set
+            if ($otherSets.length > 0) {
+                    $otherSets.animate({right : '+='+btnWidth+'px'}, atime,
+                            function () {$set.show();});
+            } else {
+                $set.show();
+            }
+        } else {
+            // remove set
+            var $set = data.$buttonSets[setIdx];
+            if ($set == null) return false;
+            //var btnWidth = $set.outerWidth();
+            // hide last set
+            $set.hide();
+            // take remaining sets and move right
+            var $otherSets = data.$elem.find('div.buttons:visible');
+            $otherSets.animate({right : '-='+btnWidth+'px'}, atime);
+        }
+        return true;
+    };
+
+    // check for buttons to highlight
+    var highlightButtons = function (data, name, on) {
+        var $buttons = data.$elem.find('div.buttons:visible'); // include hidden?
+        // add a class for highlighted button
+        var highlight = function (name, on) {
+            var $button = $buttons.find('div.button-' + name);
+            if (on) {
+                $button.addClass('button-on');
+            } else {
+                $button.removeClass('button-on');
+            }
+        };
+        if (name != null) {
+            return highlight(name, on);
+            }
+        var flags = data.scalerFlags;
+        var settings = data.settings;
+        highlight('rot', settings.rot);
+        highlight('brgt', settings.brgt);
+        highlight('cont', settings.cont);
+        highlight('bird', settings.isBirdDivVisible);
+        highlight('help', settings.isAboutDivVisible);
+        highlight('hmir', flags.hmir);
+        highlight('vmir', flags.vmir);
+        highlight('quality', flags.q1 || flags.q2);
+        highlight('zoomin', ! isFullArea(data.zoomArea));
+        };
+
+    // create Transform from area and $img
+    var getImgTrafo = function ($img, area, rot, hmir, vmir, mode, data) {
+        var picrect = geom.rectangle($img);
+        if (mode != null) {
+            var imgInfo = data.imgInfo;
+            if (mode === 'pixel') {
+                // scaler mo=clip - image area size does not come from ww, wh
+                if (imgInfo != null) {
+                    area.width = picrect.width / imgInfo.width;
+                    area.height = picrect.height / imgInfo.height;
+                } else {
+                    console.error("No image info for pixel mode!");
+                }
+            }
+            if (mode === 'size') {
+                // scaler mo=osize - image area size does not come from ww, wh
+                if (imgInfo != null) {
+                    var ddpi = parseFloat(data.settings.ddpi);
+                    area.width = (picrect.width / ddpi) / (imgInfo.width / imgInfo.dpi_x);
+                    area.height = (picrect.height / ddpi) / (imgInfo.height / imgInfo.dpi_y);
+                } else {
+                    console.error("No image info for original size mode!");
+                }
+            }
+        }
+        var trafo = geom.transform();
+        // move zoom area offset to center
+        trafo.concat(trafo.getTranslation(geom.position(-area.x, -area.y)));
+        // scale zoom area size to [1,1]
+        trafo.concat(trafo.getScale(geom.size(1/area.width, 1/area.height)));
+        // rotate and mirror (around transformed image center i.e. [0.5,0.5])
+        if (rot || hmir || vmir) {
+            // move [0.5,0.5] to center
+            trafo.concat(trafo.getTranslation(geom.position(-0.5, -0.5)));
+            if (hmir) {
+                // mirror about center
+                trafo.concat(trafo.getMirror('y'));
+                }
+            if (vmir) {
+                // mirror about center
+                trafo.concat(trafo.getMirror('x'));
+                }
+            if (rot) {
+                // rotate around center
+                trafo.concat(trafo.getRotation(parseFloat(rot)));
+                }
+            // move back
+            trafo.concat(trafo.getTranslation(geom.position(0.5, 0.5)));
+            }
+        // scale to screen position and size
+        trafo.concat(trafo.getScale(picrect));
+        trafo.concat(trafo.getTranslation(picrect));
+        return trafo;
+    };
+
+    // update scaler image transform
+    var updateImgTrafo = function (data) {
+        var $img = data.$img;
+        if ($img != null && $img.get(0).complete) {
+            // create Transform from current zoomArea and image size
+            data.imgTrafo = getImgTrafo($img, data.zoomArea,
+                    data.settings.rot, data.scalerFlags.hmir, data.scalerFlags.vmir,
+                    data.scaleMode, data);
+            // console.debug("imgTrafo=", data.imgTrafo);
+        }
+    };
+
+    // returns handler for load event of scaler img
+    var scalerImgLoadedHandler = function (data) {
+        return function () {
+            var $img = $(this);
+            console.debug("scaler img loaded=",$img);
+            var $scaler = data.$scaler;
+            var imgRect = geom.rectangle($img);
+            // adjust scaler div size
+            imgRect.adjustDiv($scaler);
+            // show image in case it was hidden (for example in zoomDrag)
+            $img.css('visibility', 'visible');
+            $scaler.css({'opacity' : '1', 'background-image' : 'none'});
+            // update display (render marks, etc.)
+            updateDisplay(data);
+        };
+    };
+
+    // handler for imageInfo loaded event
+    var handleImageInfo = function (evt, json) {
+        var data = this;
+        updateDisplay(data);
+    };
+
+    // place marks on the image
+    var renderMarks = function (data) {
+        if (data.$img == null || data.imgTrafo == null) return;
+        console.debug("renderMarks: img=",data.$img," imgtrafo=",data.imgTrafo);
+        var $elem = data.$elem;
+        var marks = data.marks;
+        // clear marks
+        $elem.find('div.mark').remove();
+        for (var i = 0; i < marks.length; i++) {
+            var mark = marks[i];
+            if (data.zoomArea.containsPosition(mark)) {
+                var mpos = data.imgTrafo.transform(mark);
+                console.debug("renderMarks: pos=",mpos);
+                // create mark
+                var html = '<div class="mark overlay">'+(i+1)+'</div>';
+                var $mark = $(html);
+                $mark.attr("id", "digilib-mark-"+(i+1));
+                $elem.append($mark);
+                mpos.adjustDiv($mark);
+                }
+            }
+    };
+
+    // zooms by the given factor
+    var zoomBy = function(data, factor) {
+        var area = data.zoomArea;
+        var newarea = area.copy();
+        // scale
+        newarea.width /= factor;
+        newarea.height /= factor;
+        // and recenter
+        newarea.x -= 0.5 * (newarea.width - area.width);
+        newarea.y -= 0.5 * (newarea.height - area.height);
+        newarea = FULL_AREA.fit(newarea);
+        data.zoomArea = newarea;
+        redisplay(data);
+    };
+
+    // add a mark where clicked
+    var setMark = function (data) {
+        var $scaler = data.$scaler;
+        // unbind other handler
+        $scaler.unbind(".dlZoomDrag");
+        // start event capturing
+        $scaler.one('mousedown.dlSetMark', function (evt) {
+            // event handler adding a new mark
+            console.log("setmark at=", evt);
+            var mpos = geom.position(evt);
+            var pos = data.imgTrafo.invtransform(mpos);
+            data.marks.push(pos);
+            redisplay(data);
+            return false;
+        });
+    };
+
+    // zoom to the area around two clicked points
+    var zoomArea = function(data) {
+        $elem = data.$elem;
+        $scaler = data.$scaler;
+        var pt1, pt2;
+        var $zoomDiv = $('<div class="zoomrect" style="display:none"/>');
+        $elem.append($zoomDiv);
+        // $zoomDiv.css(data.settings.zoomrectStyle);
+        var picRect = geom.rectangle($scaler);
+        // FIX ME: is there a way to query the border width from CSS info?
+        // rect.x -= 2; // account for overlay borders
+        // rect.y -= 2;
+
+        var zoomStart = function (evt) {
+            pt1 = geom.position(evt);
+            // setup and show zoom div
+            pt1.adjustDiv($zoomDiv);
+            $zoomDiv.width(0).height(0);
+            $zoomDiv.show();
+            // register events
+            $elem.bind("mousemove.dlZoomArea", zoomMove);
+            $elem.bind("mouseup.dlZoomArea", zoomEnd);
+            return false;
+        };
+
+        // mouse move handler
+        var zoomMove = function (evt) {
+            pt2 = geom.position(evt);
+            var rect = geom.rectangle(pt1, pt2);
+            rect.clipTo(picRect);
+            // update zoom div
+            rect.adjustDiv($zoomDiv);
+            return false;
+        };
+
+        // mouseup handler: end moving
+        var zoomEnd = function (evt) {
+            pt2 = geom.position(evt);
+            // assume a click and continue if the area is too small
+            var clickRect = geom.rectangle(pt1, pt2);
+            if (clickRect.getArea() <= 5) return false;
+            // hide zoom div
+            $zoomDiv.remove();
+            // unregister events
+            $elem.unbind("mousemove.dlZoomArea", zoomMove);
+            $elem.unbind("mouseup.dlZoomArea", zoomEnd);
+            // clip and transform
+            clickRect.clipTo(picRect);
+            var area = data.imgTrafo.invtransform(clickRect);
+            data.zoomArea = area;
+            // zoomed is always fit
+            data.settings.ws = 1;
+            delete data.dlOpts.fitwidth;
+            delete data.dlOpts.fitheight;
+            redisplay(data);
+            return false;
+        };
+
+        // clear old handler (also ZoomDrag)
+        $scaler.unbind('.dlZoomArea');
+        $scaler.unbind(".dlZoomDrag");
+        $elem.unbind('.dlZoomArea');
+        // bind start zoom handler
+        $scaler.one('mousedown.dlZoomArea', zoomStart);
+    };
+
+    // set zoom background
+    var setZoomBG = function(data) {
+        var $scaler = data.$scaler;
+        var $img = data.$img;
+        var fullRect = null;
+        // hide the scaler img, show background of div instead
+        $img.css('visibility', 'hidden');
+        var scalerCss = {
+            'background-image' : 'url(' + $img.attr('src') + ')',
+            'background-repeat' : 'no-repeat',
+            'background-position' : 'left top',
+            'opacity' : '0.5',
+            'cursor' : 'move'
+            };
+        if (data.hasBgSize) {
+            // full-size background using CSS3-background-size
+            fullRect = data.imgTrafo.transform(FULL_AREA);
+            if (fullRect.height < data.settings.maxBgSize && fullRect.width < data.settings.maxBgSize) {
+                // correct offset because background is relative
+                var scalerPos = geom.position($scaler);
+                fullRect.addPosition(scalerPos.neg());
+                var url = getBgImgUrl(data);
+                scalerCss['background-image'] = 'url(' + url + ')';
+                scalerCss[data.bgSizeName] = fullRect.width + 'px ' + fullRect.height + 'px';
+                scalerCss['background-position'] = fullRect.x + 'px '+ fullRect.y + 'px';
+            } else {
+                // too big
+                fullRect = null;
+                }
+            }
+            $scaler.css(scalerCss);
+            // isBgReady = true;
+        return fullRect;
+    };
+
+    // setup handlers for dragging the zoomed image
+    var setupZoomDrag = function(data) {
+        var startPos, delta, fullRect;
+        var $document = $(document);
+        var $data = $(data);
+        var $elem = data.$elem;
+        var $scaler = data.$scaler;
+        var $img = data.$img;
+
+        // drag the image and load a new detail on mouse up
+        var dragStart = function (evt) {
+            console.debug("dragstart at=", evt);
+            // don't start dragging if not zoomed
+            if (isFullArea(data.zoomArea)) return false;
+            $elem.find(".overlay").hide(); // hide all overlays (marks/regions)
+            startPos = geom.position(evt);
+            delta = null;
+            // set low res background immediately on mousedown
+            fullRect = setZoomBG(data);
+            $document.bind("mousemove.dlZoomDrag", dragMove);
+            $document.bind("mouseup.dlZoomDrag", dragEnd);
+            return false;
+            };
+
+        // mousemove handler: drag zoomed image
+        var dragMove = function (evt) {
+            var pos = geom.position(evt);
+            delta = startPos.delta(pos);
+            if (fullRect) {
+                var bgPos = fullRect.getPosition().add(delta);
+            } else {
+                var bgPos = delta;
+            }
+            // move the background image to the new position
+            $scaler.css({
+                'background-position' : bgPos.x + "px " + bgPos.y + "px"
+                });
+            // send message event with current zoom position
+            var za = geom.rectangle($img);
+            za.addPosition(delta.neg());
+            $data.trigger('dragZoom', [za]);
+            //TODO: setBirdZoom(data, za);
+            return false;
+            };
+
+        // mouseup handler: reload zoomed image in new position
+        var dragEnd = function (evt) {
+            $scaler.css('cursor', 'auto');
+            $document.unbind("mousemove.dlZoomDrag", dragMove);
+            $document.unbind("mouseup.dlZoomDrag", dragEnd);
+            if (delta == null || delta.distance() < 2) {
+                // no movement
+                $img.css('visibility', 'visible');
+                $scaler.css({'opacity' : '1', 'background-image' : 'none'});
+                // unhide marks
+                data.$elem.find('div.mark').show();
+                $(data).trigger('redisplay');
+                return false; 
+            }
+            // get old zoom area (screen coordinates)
+            var za = geom.rectangle($img);
+            // move
+            za.addPosition(delta.neg());
+            // transform back
+            var newArea = data.imgTrafo.invtransform(za);
+            data.zoomArea = FULL_AREA.fit(newArea);
+            redisplay(data);
+            return false;
+            };
+
+        // clear old handler
+        $document.unbind(".dlZoomDrag");
+        $scaler.unbind(".dlZoomDrag");
+        if (! isFullArea(data.zoomArea)) {
+            // set handler
+            $scaler.bind("mousedown.dlZoomDrag", dragStart);
+        }
+    };
+
+    // get image quality as a number (0..2)
+    var getQuality = function (data) {
+        var flags = data.scalerFlags;
+        var q = flags.q2 || flags.q1 || 'q0'; // assume q0 as default
+        return parseInt(q[1], 10);
+    };
+
+    // set image quality as a number (0..2)
+    var setQuality = function (data, qual) {
+        var flags = data.scalerFlags;
+        // clear flags
+        for (var i = 0; i < 3; ++i) {
+            delete flags['q'+i];
+            }
+        flags['q'+qual] = 'q'+qual;
+    };
+
+    // get image scale mode (screen, pixel, size)
+    var getScaleMode = function (data) {
+        if (data.scalerFlags.clip != null) {
+            return 'pixel';
+        } else if (data.scalerFlags.osize != null) {
+            return 'size';
+        }
+        // mo=fit is default
+        return 'screen';
+    };
+
+    // set image scale mode (screen, pixel, size)
+    var setScaleMode = function (data, mode) {
+        delete data.scalerFlags.fit;
+        delete data.scalerFlags.clip;
+        delete data.scalerFlags.osize;
+        if (mode === 'pixel') {
+            data.scalerFlags.clip = 'clip';
+        } else if (mode === 'size') {
+            data.scalerFlags.osize = 'osize';
+        }
+        // mo=fit is default
+    };
+
+     // sets a key to a value (relative values with +/- if relative=true)
+    var setNumValue = function(settings, key, value) {
+        if (value == null) return null;
+        if (isNumber(value)) {
+            settings[key] = value;
+            return value;
+        }
+        var sign = value[0];
+        if (sign === '+' || sign === '-') {
+            if (settings[key] == null) {
+                // this isn't perfect but still...
+                settings[key] = 0;
+                }
+            settings[key] = parseFloat(settings[key]) + parseFloat(value);
+        } else {
+            settings[key] = value;
+            }
+        return settings[key];
+    };
+
+    // auxiliary function, assuming equal border width on all sides
+    var getBorderWidth = function($elem) {
+        var border = $elem.outerWidth() - $elem.width();
+        return border/2;
+    };
+
+    // auxiliary function, can the current zoomarea be moved further?
+    var canMove = function(data, movx, movy) {
+        var za = data.zoomArea;
+        if (isFullArea(za)) return false;
+        var x2 = za.x + za.width;
+        var y2 = za.y + za.height;
+        return ((movx < 0) && (za.x > 0))
+            || ((movx > 0) && (x2 < 1.0))
+            || ((movy < 0) && (za.y > 0))
+            || ((movy > 0) && (y2 < 1.0))
+    };
+
+    // auxiliary function (from old dllib.js)
+    var isFullArea = function (area) {
+        return (area.width === 1.0) && (area.height === 1.0);
+    };
+
+    // auxiliary function (from Douglas Crockford, A.10)
+    var isNumber = function (value) {
+        return typeof value === 'number' && isFinite(value);
+    };
+
+    // auxiliary function to crop senseless precision
+    var cropFloat = function (x) {
+        return parseInt(10000 * x, 10) / 10000;
+    };
+
+    // idem, string version
+    var cropFloatStr = function (x) {
+        return cropFloat(x).toString();
+    };
+
+    // fallback for console.log calls
+    if (customConsole) {
+        var logFunction = function(type) {
+            return function(){
+                var $debug = $('#debug'); // debug div
+                if (!$debug) return;
+                var args = Array.prototype.slice.call(arguments);
+                var argtext = args.join(' ');
+                var $logDiv = $('<div/>');
+                $logDiv.addClass(type);
+                $logDiv.text(argtext);
+                $debug.append($logDiv);
+                };
+            };
+        console.log = logFunction('_log'); 
+        console.debug = logFunction('_debug'); 
+        console.error = logFunction('_error');
+        }
+
+    // functions to export to plugins
+    fn = {
+            geometry : geom,
+            parseQueryString : parseQueryString,
+            getScalerUrl : getScalerUrl,
+            getParamString : getParamString,
+            getDigilibUrl : getDigilibUrl,
+            unpackParams : unpackParams,
+            packParams : packParams,
+            packArea : packArea,
+            packMarks : packMarks,
+            packScalerFlags : packScalerFlags,
+            storeOptions : storeOptions,
+            redisplay : redisplay,
+            updateDisplay : updateDisplay,
+            highlightButtons : highlightButtons,
+            showDiv : showDiv,
+            setZoomBG : setZoomBG,
+            getImgTrafo : getImgTrafo,
+            getQuality : getQuality,
+            setQuality : setQuality,
+            getScaleMode : getScaleMode,
+            setScaleMode : setScaleMode,
+            canMove : canMove,
+            isFullArea : isFullArea,
+            isNumber : isNumber,
+            getBorderWidth : getBorderWidth,
+            cropFloat : cropFloat,
+            cropFloatStr : cropFloatStr
+    };
+
+    // hook digilib plugin into jquery
+    $.fn.digilib = function (action) {
+        // plugin extension mechanism, called when the plugins' code is read 
+        if (action === 'plugin') {
+            var plugin = arguments[1];
+            // each plugin needs a name
+            if (plugin.name != null) {
+                plugins[plugin.name] = plugin;
+                // share common objects
+                plugin.defaults = defaults;
+                plugin.buttons = buttons;
+                plugin.actions = actions;
+                plugin.fn = fn;
+                plugin.plugins = plugins;
+                // and install
+                if (typeof plugin.install === 'function') {
+                    plugin.install(plugin);
+                }
+            }
+            // plugins will be initialised when action.init is called
+        } else if (actions[action]) {
+            // call action on this with the remaining arguments (inserting data as first argument)
+            var $elem = $(this);
+            var data = $elem.data('digilib');
+            var args = Array.prototype.slice.call(arguments, 1);
+            args.unshift(data);
+            return actions[action].apply(this, args);
+        } else if (typeof action === 'object' || !action) {
+            // call init on the digilib jQuery object
+            return actions.init.apply(this, arguments);
+        } else {
+            $.error('action ' + action + ' does not exist on jQuery.digilib');
+        }
+    };
+
+})(jQuery);
\ No newline at end of file