--- a/js/startscreen.js	Thu Mar 21 18:48:12 2013 +0100
+++ b/js/startscreen.js	Fri Mar 22 17:03:53 2013 +0100
@@ -285,7 +285,7 @@
             }
         }
         
-        var url = "playscreen.html#visibletopics="
+        var hash = "#visibletopics="
         	+ Array.prototype.join.call($(".topic:visible").map(function(){return $(this).attr("data-topic-id")}))
         	+ "&selectedtopics="
         	+ Array.prototype.slice.call(topicsAndColors.map(function(t){return t.id}))
@@ -294,7 +294,7 @@
         		return encodeURIComponent(w);
         	}).join(",");
         	
-    	$(".play-button").attr("href",url);
+    	document.querySelector(".play-button").hash = hash;
         
     }