is it possible to use a dhtml dropdown menu over a frameset?

what i mean is, say you have a frameset doc that is two rows. the top row has your navigation and the bottom has your main page content.

could you use a dhtml dropdown and have it appear ontop of the content page?

i did a quick test and the menu would end up being cut off or show up behind the lower page.

i would like this to be on top or over(on the z axis) of my lower frame.

hope that makes sense. please ask me to re-frase it if it does not.

thanks!