This type of mouseover should be accepted pretty much everywhere:
<a href="http://www.domain.com/track/big&ugly:$url/" onmouseover="window.status='http://www.domain.com/';return true" onmouseout="self.status='';return true"> I think Tommy's is the only place where I've seen a no mouseover rule, but he's a paid submitter account place anyway, so you probably don't have to worry about his rules.