I fixed a similar problem with dropdowns not appearing on top of flash movies in IE6 / IE7 / IE8 using this jQuery :
$(function () {
$("#primary-nav").appendTo("#footer");
});
Where primary-navis the IDelement of the drop-down container, and footeris the IDlast element on the page. Then I used absolute positioning to move the drop-down lists up to where they belong.
, , , IE , z-index. - Windows Media Player.