setInterval not working in Firefox

setInterval not working in Firefox

Hi all,

Inside of $(document).ready(function () I have:

var refreshit= setInterval(function()
{
     $('#mydiv').load("mypage.htm");

}, 9000);


This is working great in IE, it loads mypage.htm into mydiv every 9 seconds. If I change the contents of mypage.htm I can see it in mydiv after 9 seconds with IE, but not with Firefox. With Firefox I can see the reloading symbol on top of the tab every 9 seconds, but I don't see the page changed.

What am I doing wrong? Please help!!
Thanks a ton in advance!