Website different in IE and Firefox

[Vipernet]

Got a quick question from my friend who is doing a website he created in frontpage. I'm trying to convince him to redo the website completely and use something other than frontpage but it's bugging me why the menu bar on the left is different in IE and Firefox.

Here's the site - http://www.attachmentresearch.org

Any help is appreciated.

 

[Vipernet]

Perfect cheers guys. I'll try and convert him over and get him to do it properly next time

 

[Vipernet]

Perfect cheers guys. I'll try and convert him over and get him to do it properly next time

already sent him across the modified stylesheet. Dunno when he'll upload it though.