ja bih to mozda ovako...
Code:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
</head>
<body>
<script language="javascript" type="text/javascript">
var days = new Array({ '1': 'red' }, { '2': 'yellow' }, { '3': 'green' }, { '4': 'red' }, { '5': 'red' }, { '6': 'red' }, { '7': 'blue' });
var jsDay = new Date().getDay();
document.body.style.backgroundColor = (days[jsDay - 1][jsDay]);
</script>
</body>
</html>
u nizu samo zameni odgovarajuce boje.
Jeste da ovo nije ASP :( ali svakako moze biti dopuna :)