i've been working on a toolbar at the top of my sample website:
http://theplagueround.com/dev/
but it gets hidden behind any youtube video content. i've seen a post or two about adding parameters to the tag, but youtube is also using iframes now so that doesn't apply.
You may want to try my plugin for Youtube (4000+ downloads so far): Youtube shortcode
No design issues have been reported.
To have a Youtube video appear behind your toolbar, you should add the parameter wmode=transparent to the end of the URL.
So change this:
to this:
More here:
If you don't want to hardcode the HTML into your posts, you should use a plugin like the one provided by @Tubal Martin. This has the advantage that if Youtube update their embed code in the future, you should only need to upgrade the plugin to the latest version.