如何使iframe在IE中得到尊重?

I have a youtube iframe element in my website, but it's next to my menu items. When I hover over a menu item, a submenu opens that partially covers the iframe (because of it's position, that's not it's specific function obviously). This works fine in Firefox, but as usual, it doesn't in IE, here the iframe covers the menu, making it basically unreadable. Is there an option I need to add to the iframe to make it work or is it just plain impossible?I have a youtube iframe element in my website,