When you validate css using a site url it takes the css that page accesses and runs . You are validating each file in isolation from inline styles.
For example:
<div style="height:100%;width:100%;border:1px solid #000;padding:2x"> <div style="float:right;width:80%;border:1px solid #000;padding:4x" class="main">
Throw up errors when you validate your page, but not when you check an individual css file. You are on the right track using external style sheets - so why not move inline styles as well? http://jigsaw.w3.org/css-validator/validator?profile=css2&warning=2&uri=http%3A//www.dotradio.uni.cc/
Marc.
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