Try click on the item "Undersida 1" (not just hit the link). This triggers the problem here.
I have isolated it into this example:
http://utv23.rnit.se/_temp/index.html
In this example the error is triggered right away when page reloads.
Are you saying you not getting this problem?? No yellow triangle in the statusbar etc?! Problem only occurs in IE 6/7 not FF as mensioned before.
And about the other example I wrote about. Is it possible?