I believe that it should be as easy as using the coding of the navbar: no porting required ...
Reason I think this, is that there is this wonderful Javascript function (with hardcoded CSS class names in it)
Code:
function vbmenu_switch_option_bg(e)
so if you have a <td class="vbmenu_option" ..., whenever u mouseover this it should change to class="vbmenu_hilite" ...
Then all u need to do is alter the color/background values of these class statements in the Style Manager, and Bob's your Auntie's live-in lover.
[please excuse me if this is not the format for which to post this kinda thing, but this was a brain-dump of the highest order ...]