Removed the 'bgiframe' javascript , which was designed for fixing IE6 issues only and causes troubles with IE9.

git-svn-id: http://svn.code.sf.net/p/itop/code/trunk@1229 a333f486-631f-4898-b8df-5754b55c2be0

js/jquery.popupmenu.js

@@ -28,7 +28,6 @@ jQuery.fn.popupmenu = function ()
 			if ( (previous_popup == null) || (previous_popup.get(0) != popupmenu.get(0))) // Comparing the DOM objects
 			{
 				// The user clicked in a different menu, let's open it
-				popupmenu.bgiframe();
 				popupmenu.positionBy({ target: $(this), 
 										targetPos: 	4, 
 										elementPos: 0,