I am using the cross domain flXHR solution with jQuery well initially it was a headache to implement but once done it was on auto pilot seems liked a gem until recently when i got the blocker of IE7 crash on windows XP. The problem seems to be caused by swfobject.js and putting it before jquery declaration will solve the problem: <script type="text/javascript" src="/flXHR/swfobject.js"/> <script type="text/javascript" src="/flXHR/flXHR.js"/>
My Opinion.