Overlapping transparent items become opaque

I’ve got several movie clips that are transparent, and then become 100% opaque when a particular button is clicked. When you mouse over the “About” tab at the top, a large sub-menu pops up, and clicking on the links “Our Story” “Franchise Info” or “contact Us” the transparent movie clip becomes 100% opaque. There is a small button labled “close” to make the movie clip transparent again. The problem is that the “close” button appears in white even though it is inside the transparent movie clip. There are several of these transparent clips on top of each other, if that makes a difference.

Any idea what the problem is?

You can see the fla here: www.tiastexmex.com/swf/index.fla
And the swf here: www.tiastexmex.com