Custom Nav Bar Dropdown menu?

[RCWF-AoD]

I'm running a simple navbar and I want to add a custom drop down menu, like the standard quick links drop downs.

Here's my problem. How could I integrate a java scipt into the drop down, so it just loads a java applet as the drop down? Such as a google adsense script?

I'm not a healthy coder, and I know a little php. I do know a bit about html, and some good java knowledge. However, I don't know what I should do to go about adding this idea.

Any ideas? Or would it be a lost cause?

Thanks,
AoD