Drop down menus across frames

Hi everyone, actually on the look out for some advice this time around.

I was wondering if its possible to create drop down menus that work on a page with frames. The setup I have has the edge of the frame directly below the menu but there isn't just a single frame beneath, there is at least 2 split vertically and will possibly contain more.

Before anyone goes off on one about not using frames the pages are being produced from a nasty webcomponent written for an accountancy package meaning I have no control over this.

Thanks,

-KM-