I believe http://www.wowinterface.com/download...poreality.html is what you're looking for.
---------- Post added 2010-07-13 at 12:13 PM ----------
@mookoo
Under bartender visibility, click the custom conditional box and put this in.
[combat]show;hide
I (think) that's the correct macro sequence for it. If I'm mistaken, there are certainly people more knowledgeable about to answer you.