Background clicking through to a layer below error

I designed an all flash website and coded in AS2 and when someone clicks to play a movie in my Commercials section, I fade in a solid black background (which is a Symbol - Graphic) and the video (FLV) plays. I noticed that while the video is playing if you click on the solid black background it clicks through to the layer below and sometimes you can click on another button/video. I don’t understand this because shouldn’t the solid black background which covers the whole screen prevent this click through? Is there some sort of code or something I need to tell the solid black background to not click through.

Here is the website, click on any of the nine videos and then click in the black area around the video to see the problem, thanks in advance:
[COLOR=#0066cc]http://www.giantsteps.us/test.html#commercials[/COLOR]