SSI Help

[.Darkman]

I am trying to create a website based on SMF theme using ssi.php
But when i type out for eg.

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<td class="windowbg">
I don't get the desired effect.
But i get only a white bg.
I also included this in the php file

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<link rel="stylesheet" type="text/css" href="http://gfxindia.com/Themes/safmc101/blue.css" />