My guess would be you would assign an OnMouseOver javascript function to the said link.
like so
Code:
<a href="http://www.somesite.com" OnMouseOver="javascript: myfunction()">Display text</a>
and the function would look something like
Code:
function myfunction() {
window.location = "http://www.somesite.com"
}
I didn't try any of this. You might have to take the HREF out of the A tag.
that's my $0.02
-Sam