[Mediawiki-l] Change logo on hover

[Platonides]

James Sweet wrote:
> If you remove the style attribute and don't add an image source, then there
> is no image at all in the anchor and therefore nothing to click on. That's
> why the transparent image is needed. It's actually what provides the link,
> but only the two background images can actually be seen.

The monobook didn't have an <img tag before you added it. It's not 
really needed.