Embed Youtube iFrame Displays But Sits in Front

Hi,

On my blog http://jasebishop.com you can see that embedded videos in the most recent posts float in front when they should be behind. Does anybody know how I can fix that?

I guess I should add that I have tried both the iframe and the old embed code from youtube, pasted directly into the html editor with the text.

Thanks

ps I tried the solution given here also but didn't work http://www.voodish.co.uk/articles/li...e-video-fixed/