+               return this.setDocumentProperty('galleryLink', gallery);
+       };
+
+       /*
+        * Set document's property
+        */
+       WikiDocument.prototype.setDocumentProperty = function(property, value) {
+               if(this[property] !== value) {
+                       this[property] = value;
+                       this.has_local_changes = true;
+               }