http://www.dynamicdrive.com/dynamici...etswitcher.htm
use that as your base, and in your <head> tag put
Code:
<link type="text/css" rel="stylesheet" href="xmas.css" title="xmas" media="screen">
<script src="styleswitch.js" type="text/javascript">
/***********************************************
* Style Sheet Switcher v1.1- © Dynamic Drive DHTML code library (www.dynamicdrive.com)
* This notice MUST stay intact for legal use
* Visit Dynamic Drive at http://www.dynamicdrive.com/ for this script and 100s more
***********************************************/
var today = new Date()
var xmasDate = today.getMonth()+today.getDay();
if(xmasDate == 1225)
{
function setStylesheet(xmas);
}
</script>
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