dhtml/flash slide in menu

I need to include a slide in dhtml/flash menu on a certain area of a webpage. The html for both pages have already been created. However, I don't know how to make the inserted page (menu) invisible and then visible onmouseover. I have mockups of what i need that i can show to make it clearer. THIS PROJECT WAS CLOSED BUT UNFORTUNATELY THE WINNING BIDDER CANNOT COMPLETE IT DUE TO A LACK OF COMMUNICATION BETWEEN PROJECT CREATOR AND SERVICE PROVIDER. THE DEADLINE FOR THIS PROJECT IS TODAY.