Video thumbnails from embedded YouTube codes appear low quality. (ACtual video after selecting is sharp) Is there a way to get the medium or high quality thumbnail for the embed code?  Is it something I could manually edit in the embed code?

For reference:

http://stackoverflow.com/questions/2068344/how-do-i-get-a-youtube-video-thumbnail-from-the-youtube-api

Tried searching the forum, but did not find...

Thanks,

Kevin