In reply to:

<link rel="stylesheet" type="text/css" href="mystyle.css" >

Remember to ensure that the server sends mystyle.css with the correct content-type. The value in the "type" attribute is just a hint to the browser (to help it choose which stylesheet, perhaps); what the server says is authoritative.
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Toby Speight
030103016 (80GB Mk2a, blue)
030102806 (0GB Mk2a, blue)