Is there a way to determine what styles can be used for a nice menu?
On the HTML tab of firebug there is a "break no mutate" button that will stop whatever javascript adds/changes HTML. This can be used to trap something that is a result of a nice menus change. It can be a little tricky as each hover initiates some javascript and then when you continue execution the break on mutate is turned off, but it gets easier with practice :)