just noticed that the add-genre popup needs some markup-change: currently there are radiobuttons without labels. instead of <li>
<input class="parent_genres" type="radio" name="tag" value="1"/>
Drum & Bass
</li> you have to change it to <li>
<input class="parent_genres" type="radio" name="tag" value="1" id="rb_dnb" />
<label for="rb_dnb">Drum & Bass</label>
</li> the usability of this box is a bit poor without those label-containers because you have no choice between clicking the tiny radiobutton itself or the text next to it!