Drop down menus and Flash content

Hi, In my website i created the menu bar which contains Home, About us, Services, Contact us etc.

I designed the website with div tag and and the problem is:

The flash content is below the menu bar and when the menu drops down it goes inside the flash content and is not visible. If i replaced the flash with image file, it works fine. I also given z-index, but of no use.

How can i solve this problem.