Revert "-- corr"

This reverts commit 5315c47fcd.

Scripts/AjaxControlToolkit/Debug/BalloonPopup.debug.js

@@ -534,8 +534,7 @@ Sys.Extended.UI.BalloonPopupControlBehavior.prototype = {
             do {
                 _elementLeftPosition += e.offsetLeft;
                 _elementTopPosition += e.offsetTop;
-                e = e.offsetParent;
-            } while(e);
+            } while(e = e.offsetParent);
         }
 
         var _pageTopPosition = this.posTop();