I think i can classify it as your java dropdown menus. well the seen to drop behind instead of infront when you have a banner up that allows for user interaction with the mouse. I did not know if you where aware of this, so i thought i might drop a line about it, btw, it is not only in the main page, but on all pages that have the same layout.
I also wanted to add, I LOVE THE NEW LAYOUT. TheDuke did a great job again. that is if he is still making the layouts.