根据不同分辨率加载不同 css 样芪表

<script language=javascript> 
<!-- 
if (screen.width == 800) 
{ 
document.write('<link rel=stylesheet type="text/css" href="css800.css">') 
} 
else {document.write('<link rel=stylesheet type="text/css" href="css1024.css">')} 
//--> 
</script>