Pop up member menu z-index?

I have difficulties finding the z-index for the pop up, since when simple messenger's chat window is open and hovering a mouse over a thumbnail there it opens pop up but underneath the chat window. Div#short_profile_info.dolPopup is filled from element style and z-index there I cannot pinpoint. Changing the z-index in #short_profile_info table.TransBox doesn't solve this. Also, the jquery.dolPopup.js is bit too confusing to know where to strike the gold mine - if the gold mine is indeed there. :)