That's PHP code, is your server PHP enabled?
The code appears to work on my PHP sandbox (WAMP), it generated today (Thursday):
HTML Code:
<style type="text/css">
body{background: url(images/thursday.jpg) no-repeat left top;}
</style>
So you would have to have a thursday.jpg in the images folder just off of the folder that this page is in. If so, it should work, unless you had another stylesheet or inline style after it that changed the body's background.
There are other things that could possibly affect this though.
If you want more help:
Please post a link to a page on your site that contains the problematic code so we can check it out.
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