That’s strange… when I try to validate your site, it goes through fine and tells me it’s valid XHTML now… (but gives two warnings: in line 169, columns 159 and 165, ‘<‘ is used in a text string, which isn’t good)
However, when I try to validate your CSS, it tells me to validate the invalid XHTML first… Huh? It tells me that, “Line 176, Column 160: The value of attribute ‘title’ associated with an element type ‘a’ must not contain the ‘<‘ character.” I take it you must have put two <‘s in the title of a link on your page, which is keeping it from validating. Change them and it should be good.
About the error you get when validating – does it say where the error occurs? I mean, is it an error that the validator gives you, or does clicking the validate link give you an error page with that message?