--- a/client/js/main.js	Fri Apr 05 13:51:47 2013 +0200
+++ b/client/js/main.js	Fri Apr 05 13:56:22 2013 +0200
@@ -289,6 +289,13 @@
         return _base + this._ID_BASE + '-' + _n;
     },
     getFullURL : function(url) {
+    	
+    	if(typeof(url) == 'undefined' || url == null ) {
+    		return "";
+    	}
+    	if(url.indexOf("http://")==0) {
+    		return url;
+    	}
     	var img = new Image();
     	img.src = url;
     	var res = img.src;