For what it is worth, and javascript, my knowledge IS really only worth 2 cents...

Why dont you decug it in Netscape, they have several javascript dubbuggers available.
Start out, is it a syntax, or runtime error.
Most likely runtime is my guess because I understand that even different versions of the same browser, let alone IE vs Mozilla/Netscape use different run libraries.

But I gotta say, I do know that debugging starts with a list of the errors generated, not manually searching the code...I think :O)))
But this is over my head somewhat, I am trying to learn also LOL