Dynamic graphical menu with rollover and images map

Hi,

I'm trying to find the way to do a graphical menu with rollover effects and images maps. It would be fairyl easy except for the fact that the images map need to be active only if the rollover image is active.

Basically, there 4 buttons that change color when the mouse get over them and that activate a submenu on their side. The submenu stay active when you get on it (easy to achieve effect). The problem is that I need the submenu to have some kind of image map and make sure that the user can only click on the links when the image is active. (ie if the image is not showing up, no links, if the user got over the button associated with that submenu then click on a link on the submenu, call this page).

I'm pretty sure I could get away with it by showing the submenu when the cursor pass over it (not just when it get over the button associated with it), but I still want to know if I can do it! URL

If there's no way with JavaScript alone, I'm sure there's a way with DHTML, no? URL