Ok. I edited Popup Menu Body section (added the code he said to add) and all DHTML menus appear transparent in Moz, but not IE. Why would I have to edit those templates for IE but it works w/o editing them and just the CSS options for Moz?

filter:opacity(); is the code for IE
-moz-opacity: is the code for Moz

As far as i know i made it work for IE and Moz :)
I tested it on IE before i added the code for Moz so it should work (and it does like rebelsrock06 said) :)