Prefix ids with "back_" in back-end layout to avoid conflict with site's ids

app/assets/javascripts/side_bar_history.js

@@ -1,5 +1,5 @@
 $(function () { 
-  $('#panel_sidebar a, #panel_main a.nav').live('click',  
+  $('#back_sidebar a, #panel_main a.nav').live('click',  
     function () {  
       $.getScript(this.href);
 			history.pushState(null, document.title, this.href);