If you are having trouble getting a DHTML drop-down menu to display on top of a Flash movie try adding the following to the <object> tag that embeds the .swf file in your .html.
Add the following as a child to the <object> tag:
<param name=”wmode” value=”transparent” />
Add the following as an attribute to the <object> tag:
wmode=”transparent”
I was having trouble getting a JavaScript dropdown to render over a Flash movie under IE and after adding the aforementioned tags it works just fine.