--- a/src/hdalab/static/hdalab/js/trees.js	Thu Mar 05 16:48:47 2015 +0100
+++ b/src/hdalab/static/hdalab/js/trees.js	Thu Mar 05 16:58:28 2015 +0100
@@ -5,7 +5,7 @@
     return this.each(function(){
         var img = $(this),
             src = img.data("src");
-        src && img.attr("src", src).load(function(){
+        src && img.attr("src") !== src && img.attr("src", src).load(function(){
             img[args[0]||"show"].apply(img, args.splice(1));
         });
     });