I am having an issue in FF that I think is also related to the display:none but I havent been able to identify it yet.
http://dev-alcon.virtualhorizons.com/catalog_pages/Dimensions.asp?rollover=1

part of number menu seems to be getting blocked by the drop down menu even though it is set to display:none

I am really perplexed on this one. I sure hope you guys can help.