Developing applications to work on IE is such a pain. I always had to do a lot of tricks to debug my code in IE. Firebug in Firefox helped me perform a great deal of debugging, but the ons specific to IE- they where always a problem untill I found a reasonable debugging tool for it.
Its none other that the Firebug itself. It seems to be compatible with IE but not as extensive as the one in firefox.
Inorder to get this tool working all we have to do is to incorporate/add the following line of code to our web page and we are good to go..
Hope this helps :)