I knew I could make a gadget that works on Opera, too. Yesterday evening I coded first a javascript version, and today morning a little tidier jQuery version.
Installation is simple: add an HTML/Javascript gadget and put the following code in it:
You can leave out the first line, if your template already loads jQuery. Make necessary configuration changes (change YouTube user name, for example). I did only very basic CSS, you can of course modify it to your liking. Code can be used also outside Blogger (in any html page).