--- a/static/tiles2.js	Sat Jan 09 14:43:51 2010 +0200
+++ b/static/tiles2.js	Sat Jan 09 15:13:42 2010 +0200
@@ -87,7 +87,9 @@
         this.draggable = new Draggable(this.substrate, {
             onStart: this.on_scroll_start.bind(this),
             onDrag: this.on_scroll_move.bind(this),
-            onEnd: this.on_scroll_end.bind(this)
+            onEnd: this.on_scroll_end.bind(this),
+
+            zindex: false
         });
 
         // register event handlers for other UI functions