--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/client/digitallibrary/jquery/ui/jquery.digilib.SLIDER.js	Sun Feb 06 22:17:41 2011 +0100
@@ -0,0 +1,1613 @@
+/* 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 = true;
+}
+
+(function($) {
+    var buttons = {
+        reference : {
+            onclick : "reference",
+            tooltip : "get a reference URL",
+            img : "reference.png"
+            },
+        zoomin : {
+            onclick : ["zoomBy", 1.4],
+            tooltip : "zoom in",
+            img : "zoom-in.png"
+            },
+        zoomout : {
+            onclick : ["zoomBy", 0.7],
+            tooltip : "zoom out",
+            img : "zoom-out.png"
+            },
+        zoomarea : {
+            onclick : "zoomArea",
+            tooltip : "zoom area",
+            img : "zoom-area.png"
+            },
+        zoomfull : {
+            onclick : "zoomFull",
+            tooltip : "view the whole image",
+            img : "zoom-full.png"
+            },
+        pagewidth : {
+            onclick : ["zoomFull", "width"],
+            tooltip : "page width",
+            img : "pagewidth.png"
+            },
+        back : {
+            onclick : ["gotoPage", "-1"],
+            tooltip : "goto previous image",
+            img : "back.png"
+            },
+        fwd : {
+            onclick : ["gotoPage", "+1"],
+            tooltip : "goto next image",
+            img : "fwd.png"
+            },
+        page : {
+            onclick : "gotoPage",
+            tooltip : "goto image number",
+            img : "page.png"
+            },
+        bird : {
+            onclick : "showBirdDiv",
+            tooltip : "show bird's eye view",
+            img : "birds-eye.png"
+            },
+        help : {
+            onclick : "showAboutDiv",
+            tooltip : "about Digilib",
+            img : "help.png"
+            },
+        reset : {
+            onclick : "reset",
+            tooltip : "reset image",
+            img : "reset.png"
+            },
+        mark : {
+            onclick : "setMark",
+            tooltip : "set a mark",
+            img : "mark.png"
+            },
+        delmark : {
+            onclick : "removeMark",
+            tooltip : "delete the last mark",
+            img : "delmark.png"
+            },
+        hmir : {
+            onclick : ["mirror", "h"],
+            tooltip : "mirror horizontally",
+            img : "mirror-horizontal.png"
+            },
+        vmir : {
+            onclick : ["mirror", "v"],
+            tooltip : "mirror vertically",
+            img : "mirror-vertical.png"
+            },
+        rot : {
+            onclick : "rotate",
+            tooltip : "rotate image",
+            img : "rotate.png"
+            },
+        brgt : {
+            onclick : "brightness",
+            tooltip : "set brightness",
+            img : "brightness.png"
+            },
+        cont : {
+            onclick : "contrast",
+            tooltip : "set contrast",
+            img : "contrast.png"
+            },
+        rgb : {
+            onclick : "javascript:setParamWin('rgb', '...')",
+            tooltip : "set rgb values",
+            img : "rgb.png"
+            },
+        quality : {
+            onclick : "setQuality",
+            tooltip : "set image quality",
+            img : "quality.png"
+            },
+        size : {
+            onclick : "javascript:toggleSizeMenu()",
+            tooltip : "set page size",
+            img : "size.png"
+            },
+        calibrationx : {
+            onclick : "javascript:calibrate('x')",
+            tooltip : "calibrate screen x-ratio",
+            img : "calibration-x.png"
+            },
+        scale : {
+            onclick : "javascript:toggleScaleMenu()",
+            tooltip : "change image scale",
+            img : "original-size.png"
+            },
+        toggleoptions : {
+            onclick : "moreButtons",
+            tooltip : "more options",
+            img : "options.png"
+            },
+        moreoptions : {
+            onclick : ["moreButtons", "+1"],
+            tooltip : "more options",
+            img : "options.png"
+            },
+        lessoptions : {
+            onclick : ["moreButtons", "-1"],
+            tooltip : "less options",
+            img : "options.png"
+            },
+        SEP : {
+            img : "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','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/',
+                'standardSet' : ["reference","zoomin","zoomout","zoomarea","zoomfull","pagewidth","back","fwd","page","bird","help","reset","toggleoptions"],
+                'specialSet' : ["mark","delmark","hmir","vmir","rot","brgt","cont","rgb","quality","size","calibrationx","scale","toggleoptions"],
+                'buttonSets' : ['standardSet', 'specialSet']
+                },
+            'embedded' : {
+                'imagePath' : 'img/embedded/16/',
+                'standardSet' : ["reference","zoomin","zoomout","zoomarea","zoomfull","bird","help","reset","toggleoptions"],
+                'specialSet' : ["mark","delmark","hmir","vmir","rot","brgt","cont","rgb","quality","toggleoptions"],
+                'buttonSets' : ['standardSet', 'specialSet']
+                }
+        },
+        // number of visible button groups
+        'visibleButtonSets' : 1,
+        // is birdView shown?
+        'isBirdDivVisible' : false,
+        // dimensions of bird's eye div
+        'birdDivWidth' : 200, 
+        'birdDivHeight' : 200,
+        // parameters used by bird's eye div
+        'birdDivParams' : ['fn','pn','dw','dh'],
+        // style of the zoom area indicator in the bird's eye div 
+        'birdIndicatorStyle' : {'border' : '2px solid #ff0000' },
+        // style of zoom area "rubber band"
+        'zoomrectStyle' : {'border' : '2px solid #ff0000' },
+        // is the "about" window shown?
+        'isAboutDivVisible' : false,
+        // maximum width of background image for drag-scroll
+        'maxBgSize' : 10000
+
+        };
+
+    // affine geometry classes
+    var geom = dlGeometry();
+
+    var FULL_AREA = geom.rectangle(0, 0, 1, 1);
+
+    var actions = {
+        // init: digilib initialization
+        init : function(options) {
+            // 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 (jQuery.cookie) {
+                            // retrieve params from cookie
+                            var ck = "digilib-embed:fn:" + escape(params.fn) + ":pn:" + (params.pn || '1');
+                            var cs = jQuery.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;
+                                jQuery.extend(params, cp);
+                            }
+                        }
+                    }
+                    // store $(this) element in the settings
+                    elemSettings = jQuery.extend({}, settings, params);
+                    data = {
+                            $elem : $elem,
+                            settings : elemSettings,
+                            queryParams : params
+                    };
+                    // store in 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';                        
+                        }
+                    }
+                }
+                // create HTML structure for scaler
+                setupScalerDiv(data);
+                // add buttons
+                for (var i = 0; i < elemSettings.visibleButtonSets; ++i) {
+                    showButtons(data, true, i);
+                    }
+                // bird's eye view creation
+                if (elemSettings.isBirdDivVisible) {
+                    setupBirdDiv(data);
+                    data.$birdDiv.show();
+                    }
+                // about window creation - TODO: could be deferred? restrict to only one item?
+                setupAboutDiv(data);
+                // drag zoom area around in scaler div 
+                setupZoomDrag(data);
+                // dialog for brightness, rotate etc. 
+                setupDialogDiv(data);
+            });
+        },
+
+        // destroy: clean up digilib
+        destroy : function(data) {
+            return this.each(function(){
+                var $elem = $(this);
+                $(window).unbind('.digilib'); // unbind all digilibs(?)
+                data.digilib.remove();
+                $elem.removeData('digilib');
+            });
+        },
+
+        // show or hide the 'about' window
+        showAboutDiv : function(data, show) {
+            data.settings.isAboutDivVisible = showDiv(data.settings.isAboutDivVisible, data.$aboutDiv, show);
+        },
+
+        // event handler: toggles the visibility of the bird's eye window 
+        showBirdDiv : function (data, show) {
+            var settings = data.settings;
+            if (data.$birdDiv == null) {
+                // no bird div -> create
+                setupBirdDiv(data);
+            }
+            settings.isBirdDivVisible = showDiv(settings.isBirdDivVisible, data.$birdDiv, show);
+            updateBirdDiv(data);
+            storeOptions(data);
+            // data.$birdImg.triggerHandler('load'); // TODO: we shouldn't do that
+        },
+
+        // 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;
+                }
+            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 interactively
+        zoomArea : function (data) {
+            zoomArea(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);
+        },
+
+        // 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);
+                var $slider = data.$slider;
+                $slider.slider('enable');
+                var $dialog = data.$dialog;
+                $dialog.text('Set the slider');
+                $dialog.dialog('option', {
+                    'title' : 'set rotation angle',
+                    });
+                $dialog.dialog('open');
+            }
+            //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);
+            }
+        }
+    };
+
+    // 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 getBirdImgUrl = function (data, moreParams) {
+        var settings = data.settings;
+        var birdDivOptions = {
+                dw : settings.birdDivWidth,
+                dh : settings.birdDivHeight
+        };
+        var birdSettings = jQuery.extend({}, settings, birdDivOptions);
+        // use only the relevant parameters
+        if (moreParams == null) {
+            var params = getParamString(birdSettings, settings.birdDivParams, defaults);
+        } else {
+            var params = getParamString(birdSettings, 
+                    settings.birdDivParams.concat(moreParams), 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;
+    };
+
+    // 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;
+        retrieveOptions(data);
+    };
+
+    // put objects back into parameters
+    var packParams = function (data) {
+        var settings = data.settings;
+        // zoom area
+        if (data.zoomArea) {
+            settings.wx = cropFloat(data.zoomArea.x);
+            settings.wy = cropFloat(data.zoomArea.y);
+            settings.ww = cropFloat(data.zoomArea.width);
+            settings.wh = cropFloat(data.zoomArea.height);
+            }
+        // marks
+        if (data.marks) {
+            settings.mk = '';
+            for (var i = 0; i < data.marks.length; i++) {
+                if (i) {
+                    settings.mk += ',';
+                    }
+                settings.mk += cropFloat(data.marks[i].x).toString() +
+                    '/' + cropFloat(data.marks[i].y).toString();
+                }
+            }
+        // Scaler flags
+        if (data.scalerFlags) {
+            var mo = '';
+            for (var f in data.scalerFlags) {
+                if (mo) {
+                    mo += ',';
+                }
+                mo += f;
+            }
+            settings.mo = mo;
+        }
+        // user interface options
+        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 (jQuery.cookie) {
+                var ck = "digilib:fn:" + escape(settings.fn) + ":pn:" + settings.pn;
+                console.debug("set cookie=", ck, " value=", clop);
+                jQuery.cookie(ck, clop);
+                }
+        }
+        if (settings.interactionMode !== 'fullscreen' && jQuery.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);
+            jQuery.cookie(ck, qs);
+        }
+    };
+
+    var retrieveOptions = function (data) {
+        // clop (digilib options)
+        var opts = {};
+        var settings = data.settings;
+        if (jQuery.cookie) {
+            // read from cookie
+            var ck = "digilib:fn:" + escape(settings.fn) + ":pn:" + settings.pn;
+            var cp = jQuery.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("we could modify history, but we don't...");
+                }
+            window.location = url;
+        } else {
+            // embedded mode -- just change img src
+            var url = getScalerUrl(data);
+            data.$img.attr('src', url);
+            // redisplay bird img
+            updateBirdDiv(data);
+            }
+    };
+
+    // returns maximum size for scaler img in fullscreen mode
+    var getFullscreenImgSize = function($elem) {
+        var $win = $(window);
+        var winH = $win.height();
+        var winW = $win.width();
+        // TODO: account for borders?
+        return geom.size(winW, winH);
+    };
+
+    // 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
+            $elem.addClass('dl_fullscreen');
+            var imgSize = getFullscreenImgSize($elem);
+            // 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) {
+                oldUrl = $img.attr('src');
+                if (oldUrl === scalerUrl) {
+                    console.debug("img detach:", $img);
+                    $img.detach();
+                } else {
+                    $img = $('<img/>');
+                }
+            } else {
+                $img = $('<img/>');
+            }
+        }
+        // create new html
+        $elem.empty(); // TODO: should we keep stuff for customization?
+        var $scaler = $('<div class="scaler"/>');
+        $elem.append($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.attr('src', scalerUrl);
+    };
+
+    // 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;
+        }
+        var $buttonsDiv = $('<div class="buttons"/>');
+        var buttonNames = buttonSettings[buttonGroup];
+        for (var i = 0; i < buttonNames.length; i++) {
+            var buttonName = buttonNames[i];
+            var buttonConfig = settings.buttons[buttonName];
+            // construct the button html
+            var $button = $('<div class="button"></div>');
+            var $a = $('<a/>');
+            var $img = $('<img class="button"/>');
+            $buttonsDiv.append($button);
+            $button.append($a);
+            $a.append($img);
+            // add attributes and bindings
+            $button.attr('title', buttonConfig.tooltip);
+            $button.addClass('button-' + buttonName);
+            // create handler for the buttons
+            $a.bind('click.digilib', (function () {
+                // we create a new closure to capture the value of action
+                var action = buttonConfig.onclick;
+                if ($.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;
+                    };
+                }
+            })());
+            $img.attr('src', buttonSettings.imagePath + buttonConfig.img);
+        }
+        // make buttons div scroll if too large for window
+        if ($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 HTML structure for the bird's eye view in elem
+    var setupBirdDiv = function (data) {
+        var $elem = data.$elem;
+        // the bird's eye div
+        var $birdDiv = $('<div class="birdview" style="display:none"/>');
+        // the detail indicator frame
+        var $birdZoom = $('<div class="birdzoom" style="display:none; background-color:transparent;"/>');
+        // the small image
+        var $birdImg = $('<img class="birdimg"/>');
+        data.$birdDiv = $birdDiv;
+        data.$birdZoom = $birdZoom;
+        data.$birdImg = $birdImg;
+        $elem.append($birdDiv);
+        $birdDiv.append($birdZoom);
+        $birdDiv.append($birdImg);
+        $birdZoom.css(data.settings.birdIndicatorStyle);
+        var birdUrl = getBirdImgUrl(data);
+        $birdImg.load(birdImgLoadedHandler(data));
+        $birdImg.attr('src', birdUrl);
+    };
+
+    // update bird's eye view
+    var updateBirdDiv = function (data) {
+        if (!data.settings.isBirdDivVisible) return;
+        var $birdImg = data.$birdImg;
+        var oldsrc = $birdImg.attr('src');
+        var newsrc = getBirdImgUrl(data);
+        if (oldsrc !== newsrc) {
+            $birdImg.attr('src', newsrc);
+            // onload handler re-renders
+        } else {
+            // re-render
+            renderBirdArea(data);
+            // enable click and drag
+            setupBirdDrag(data);
+        }
+    };
+
+    // creates HTML structure for the dialog
+    var setupDialogDiv = function (data) {
+        var $elem = data.$elem;
+        var settings = data.settings;
+        var $dialogDiv = $('<div/>');
+        var $sliderDiv = $('<div/>');
+        $dialogDiv.append($sliderDiv);
+        $dialogDiv.dialog({
+            'autoOpen' : false,
+            'buttons': {
+                "Ok": function() { 
+                    $(this).dialog("close"); 
+                    }, 
+                "Cancel": function() { 
+                    $(this).dialog("close"); 
+                    } 
+                }
+		    });
+		$sliderDiv.slider({
+			'range' : true,
+			'min' : 0,
+			'max' : 500,
+			'values' : [ 75, 300 ]
+		    });
+        data.$dialog = $dialogDiv;
+        data.$slider = $sliderDiv;
+    };
+
+    // 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 Graphic 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);
+        // click hides
+        $aboutDiv.bind('click.digilib', function () { 
+            settings.isAboutDivVisible = showDiv(settings.isAboutDivVisible, $aboutDiv, 0);
+            return false;
+            });
+        data.$aboutDiv = $aboutDiv;
+    };
+
+    // 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;
+        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;
+            var btnWidth = $set.width();
+            // move remaining sets left and show new set
+            if ($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.width();
+            // 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;
+    };
+
+    // create Transform from area and $img
+    var getImgTrafo = function ($img, area, rot, hmir, vmir) {
+        var picrect = geom.rectangle($img);
+        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;
+    };
+
+    // returns function for load event of scaler img
+    var scalerImgLoadedHandler = function (data) {
+        return function () {
+            var $img = $(this);
+            var $scaler = data.$scaler;
+            // create Transform from current area and picsize
+            data.imgTrafo = getImgTrafo($img, data.zoomArea,
+                    data.settings.rot, data.scalerFlags.hmir, data.scalerFlags.vmir);
+            console.debug("imgTrafo=", data.imgTrafo);
+            // adjust scaler div size
+            var imgRect = geom.rectangle($img);
+            console.debug("imgrect=", imgRect);
+            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'});
+            // display marks
+            renderMarks(data);
+            // enable drag-to-scroll
+            setupZoomDrag(data);
+            // TODO: digilib.showArrows(); // show arrow overlays for zoom navigation
+        };
+    };
+
+    // returns function for load event of bird's eye view img
+    var birdImgLoadedHandler = function (data) {
+        return function () {
+            var $img = $(this);
+            console.debug("birdimg loaded! this=", this, " data=", data);
+            // create Transform from current area and picsize
+            data.birdTrafo = getImgTrafo($img, FULL_AREA);
+            // display red indicator around zoomarea
+            renderBirdArea(data);
+            // enable click and drag
+            setupBirdDrag(data);
+        };
+    };
+
+    // place marks on the image
+    var renderMarks = function (data) {
+        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: mpos=",mpos);
+                // create mark
+                var html = '<div class="mark">'+(i+1)+'</div>';
+                var $mark = $(html);
+                $elem.append($mark);
+                mpos.adjustDiv($mark);
+                }
+            }
+    };
+
+    // show zoom area indicator on bird's eye view
+    var renderBirdArea = function (data) {
+        var $birdZoom = data.$birdZoom;
+        var zoomArea = data.zoomArea;
+        var normalSize = isFullArea(zoomArea);
+        if (normalSize) {
+            $birdZoom.hide();
+            return;
+        } else {
+            $birdZoom.show();
+        }
+        // position may have changed
+        data.birdTrafo = getImgTrafo(data.$birdImg, FULL_AREA);
+        var zoomRect = data.birdTrafo.transform(zoomArea);
+        // acount for border width
+        zoomRect.addPosition({x : -2, y : -2});
+        if (data.settings.interactionMode === 'fullscreen') {
+            // no animation for fullscreen
+            zoomRect.adjustDiv($birdZoom);
+        } else {
+            // nice animation for embedded mode :-)
+            // correct offsetParent because animate doesn't use offset
+            var ppos = $birdZoom.offsetParent().offset();
+            var dest = {
+                    left : (zoomRect.x - ppos.left) + 'px',
+                    top : (zoomRect.y - ppos.top) + 'px',
+                    width : zoomRect.width,
+                    height : zoomRect.height};
+            $birdZoom.animate(dest);
+        }
+    };
+
+    // 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);
+    };
+
+    // bird's eye view zoom area click and drag handler
+    var setupBirdDrag = function(data) {
+        var $birdImg = data.$birdImg;
+        var $birdZoom = data.$birdZoom;
+        var $document = $(document);
+        var $scaler = data.$scaler;
+        var startPos, newRect, birdImgRect, birdZoomRect, fullRect, scalerPos;
+
+        // mousedown handler: start dragging bird zoom to a new position
+        var birdZoomStartDrag = function(evt) {
+            startPos = geom.position(evt);
+            // position may have changed
+            data.birdTrafo = getImgTrafo($birdImg, FULL_AREA);
+            birdImgRect = geom.rectangle($birdImg);
+            birdZoomRect = geom.rectangle($birdZoom);
+            scalerPos = geom.position($scaler);
+            newRect = null;
+            fullRect = setZoomBG(data); // setup zoom background image
+            $document.bind("mousemove.dlBirdMove", birdZoomMove);
+            $document.bind("mouseup.dlBirdMove", birdZoomEndDrag);
+            return false;
+        };
+
+        // mousemove handler: drag
+        var birdZoomMove = function(evt) {
+            var pos = geom.position(evt);
+            var delta = startPos.delta(pos);
+            // move birdZoom div, keeping size
+            newRect = birdZoomRect.copy();
+            newRect.addPosition(delta);
+            newRect.stayInside(birdImgRect);
+            // reflect birdview zoom position in scaler image
+            var area = data.birdTrafo.invtransform(newRect);
+            var imgArea = data.imgTrafo.transform(area);
+            var offset = imgArea.getPosition().neg();
+            offset.add(scalerPos);
+            console.log('offset', offset);
+            if (fullRect) {
+                var bgPos = fullRect.getPosition().add(offset);
+            } else {
+                var bgPos = offset;
+            }
+            // move the background image to the new position
+            data.$scaler.css({
+                'background-position' : bgPos.x + "px " + bgPos.y + "px"
+                });
+            // acount for border width
+            newRect.addPosition({x : -2, y : -2});
+            newRect.adjustDiv($birdZoom);
+            return false;
+        };
+
+        // mouseup handler: reload page
+        var birdZoomEndDrag = function(evt) {
+            var settings = data.settings;
+            $document.unbind("mousemove.dlBirdMove", birdZoomMove);
+            $document.unbind("mouseup.dlBirdMove", birdZoomEndDrag);
+            if (newRect == null) { 
+                // no movement happened - set center to click position
+                startPos = birdZoomRect.getCenter();
+                birdZoomMove(evt); 
+                }
+            // ugly, but needed to prevent double border width compensation
+            newRect.addPosition({x : +2, y : +2});
+            var newArea = data.birdTrafo.invtransform(newRect);
+            data.zoomArea = newArea;
+            redisplay(data);
+            return false;
+        };
+
+        // clear old handler
+        $document.unbind(".dlBirdMove");
+        $birdImg.unbind(".dlBirdMove");
+        $birdZoom.unbind(".dlBirdMove");
+        if (! isFullArea(data.zoomArea)) {
+            // set new handler
+            $birdImg.bind("mousedown.dlBirdMove", birdZoomStartDrag);
+            $birdZoom.bind("mousedown.dlBirdMove", birdZoomStartDrag);
+        }
+    };
+
+    // move bird zoom indicator to reflect zoomed detail area
+    var setBirdZoom = function(data, rect) {
+        var part = data.imgTrafo.invtransform(rect);
+        // area = FULL_AREA.fit(part); // no, we want to see where we transcend the borders
+        birdTrafo = getImgTrafo(data.$birdImg, FULL_AREA);
+        var birdRect = birdTrafo.transform(part);
+        // acount for border width
+        birdRect.addPosition({x : -2, y : -2});
+        birdRect.adjustDiv(data.$birdZoom);
+    };
+
+    // 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 = getBirdImgUrl(data, ['rot', 'mo']);
+                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 $elem = data.$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;
+            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
+            $scaler.css({
+                'background-position' : bgPos.x + "px " + bgPos.y + "px"
+                });
+            // set birdview indicator to reflect new zoom position
+            var za = geom.rectangle($img);
+            za.addPosition(delta.neg());
+            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');
+                $scaler.css({'opacity' : '1', 'background-image' : 'none'});
+                return false; 
+            }
+            // get old zoom area (screen coordinates)
+            var za = geom.rectangle($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;
+    };
+
+    // 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 (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 isNumber(value) {
+        return typeof value === 'number' && isFinite(value);
+    };
+
+    // auxiliary function to crop senseless precision
+    var cropFloat = function (x) {
+        return parseInt(10000 * x, 10) / 10000;
+    };
+
+    // 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');
+        }
+
+    // hook plugin into jquery
+    $.fn.digilib = function(action) {
+        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 this
+            return actions.init.apply(this, arguments);
+        } else {
+            $.error('action ' + action + ' does not exist on jQuery.digilib');
+        }
+    };
+
+})(jQuery);
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