frames and horizontal drop down menu

[tvrob]

Hello,
I'm having problems with A top frame and mainFrame.

I have a nice Horizontal drop down menu as the mouse hovers over on the top frame, on the mainframe underneath it when i hover over the drop down menu, the menu dropped down disappears whatever the top images is in the mainFrame which is underneath the top frame.

So my questions. I am new to web design, I can make a basic webpage, but know nothing about java... can these work together and how can I get these to work together somehow.

Thanks