I already made rollovers buttons for a website I am making and I made a horizontal spry menubar successfully, however instead of the main item I’d like to put in its place this rollover button I created. So the drop down items come from rolling over this rollover image. How do I do this? Is it even possible?

if you are using Dreamweaver, open the nav buttons section, and use the behavior option on your right hand side. then choose rollover options.