Help tip covered by panel control

I'm using the following code for a help tip for a button:
http://www.dynamicdrive.com/dynamici...mltooltip2.htm

The page which contains the button, has a panel, and the panel is hiding the help tip when the user does a mouseover on the button. You can see the help tip, but only the bottom half. I can't seem to get the help tip in front / on top of the panel to see it 100%.

I've tried to assign priority="1" for the javascript, but that didn't work either.

Any suggestions are welcome!

Thanks!