I\'m stuck on what appears to be a CSS/z-index conflict with the YouTube player. In Firefox 3 under Windows XP, Take a look at this page: http://spokenword.org/program/21396
although the recommendation by CMS is valid, there is an important update. If you want to use 'iframe' instead of 'embed' , simply add ?wmode=transparent
to your video link and that does the magic. I find this more simple and clean.
Update, Feb 2014
It's been a while and this may be outdated.
Somebody reported that now &wmode=transparent
works instead.