--- zogiLib/js/Attic/navigation.js	2004/04/28 09:03:21	1.4
+++ zogiLib/js/Attic/navigation.js	2004/04/28 16:27:16	1.5
@@ -388,7 +388,11 @@ function getElement(tagid) {
 	alert("document.all!");
 	return document.all[tagid];
     } else {
-	alert("no document.all!");
+	var s = "";
+	for (var e in document.layers) {
+	    s += "'" + e + "', ";
+	}
+	alert("no document.all! "+tagid+" = "+s);
 	return document[tagid];
     }
 }    
@@ -541,14 +545,20 @@ function bestPicSize(tagid) {
     var inset = 0;
     var ws = getWinSize();
     var es = getElementSize(tagid);
-    ws.width = ws.width - es.x - inset;
-    ws.height = ws.height - es.y - inset;
+    if (es) {
+	ws.width = ws.width - es.x - inset;
+	ws.height = ws.height - es.y - inset;
+    }
     return ws;
 }
 
 
 
 function init() {
+    if (document.layers) {
+	alert("Sorry Netscape4 is not supported!");
+	return false;
+    }
     // give a name to the window containing digilib - this way one can test if there is already a
     // digilib-window open and replace the contents of it (ex. digicat)
     top.window.name = "digilib";