Why are they all activated on mouseover? That doesn't make any sense to me. IMO I think that mouseovers are only good for displaying tooltips or something along those lines.
What's wrong with a click?
What's wrong with a click?
Moreover, it would be better for consistency between the javascript-enabled and disabled versions to use a click, which could be a minor win if one sometimes uses the site with javascript and without depending on what computer they're accessing from.