If you are looking for something like a tooltip, you can add a title
attribute to any HTML anchor like so
<a href="mypage.htm" title="Here is some text to describe it">mypage.htm</a>
Opening a true pop-up window is problematic because a lot of users now have
pop-up blockers. It is also difficult to control a pop-up window and a lot
of users will also receive an error when the pop-up is closed
programatically. Best bet is to try the title attribute of the link, though
right now I think this only works with IE>
Hope this helps,
Mark Fitzpatrick
Microsoft MVP - FrontPage