Sub-menu item hidden by header module

In IE8 I have sub-menu items hidden by a header module. I've seen post indicating you can adjust Z-index but have been unable to locate the css file/line # that is used. Is it template.css or mega.css
I'm using the mega menu. There is AVreloaded module in header position. All other browsers seem ok.

[attachment]menuHidden.bmp[/attachment]


Site is : http://www.talkingbaseball.net/

It is the second menu item Ed Randall, where the drop down Ed's Blog is hidden.

Thanks in advance for your help.

Hi

Please do not duplicate the questions. I'm closing this one.