Ver such mal Folgendes:
Code:
<head>
[...]
<script language="JavaScript" type="text/javascript">
<!--
if (window.screen.width > 800)
{
document.writeln('<link rel="StyleSheet" type="text/css" href="1024.css" />');
}
else
{
document.writeln('<link rel="StyleSheet" type="text/css" src="800.css" />
}
//-->
</script>
<noscript>
<link rel="StyleSheet" type="text/css" href="800.css" />
</noscript>
[...]
</head>
HTH
~