Professional :: Flash Thumbnail Gallery - Making Window Clip Inactive After Click?

I am an artist trying to remake my website...I have a picture of a window on my homepage. The window is a movie. When clicked on, the window lights turn on and a grid of thumbnail pics appear. Each thumbnail is a movie clip. When a thumbnail is clicked on, the movie plays and a larger image appears over the window. The problem is, the window is still active underneath the large image, so if I click on the large image, I am really clicking on the window movie clip underneath, and the thumbnail grid disappears-starting the window movie clip over. How do I make the window clip inactive after it is initially clicked? Also, I would like the larger images to end their movie clips after another thumbnail is clicked, so that there aren't large images piled up on top of each other.