CSS validation

I need to validate my web pages for CSS as part of my Graduate School 
assignment.  However, every time I try to check them the site takes forever 
and never finishes the task.  I tried from my home computer and a school 
computer lab using both Internet Explorer and Netscape.

I was unsure if this was a site problem at this time or an error on my 
computer.

Sincerely,
Natalie Bromann