Well having tested it at the link in the sticky post on this forum... I got a million and three errors and warnings... but I made the stylesheet, with no knowlege of CSS, using the trusty "trial and error" method :-)
The testing site is used to validate the style sheets to verify that they are css1-compliant. This means that they will render or look the same in a wide veriety of browser/OS combinations. The page may look great with Internet Explorer but other browsers such as Netscape 4.7+ may not see it that way.
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Thanks for the contribution... I can help you with the errors if you are still getting them 
