where is it saying :hover white?

http://www.elevationsclothing.co.uk/

have created nav menu down the side. It uses three stylesheets from my template folder, none of which define a default style for all hover and visited elements. and yet when you hover or click a link. It dissapears! its turning white for some reason.

I have the firefox extension and have been checking over all the classes and id's but I cant work out where it is telling it to display white. Have I maybe missed out defining it properly at some point.

Any help is much appreciated, please be gentle on the site. Its still very much a work in progress!

Firebug says
stylesheet_new.css (line 434)

#chcategoriesContent a:link, a:visited, a:hover {
color:#FFFFFF;
}

You have so many overlapping and duplicated styles that it is no wonder you are confused by this one. Try to put your work into one stylesheet, and eliminate or combine duplicates.