if (navigator.platform && (navigator.platform.indexOf('Mac')) > -1) {
	//mac users
	document.write('<LINK HREF="mac.css" REL="styleSheet" TYPE="text/css">');
	document.write('<STYLE TYPE="text/css"><!-- @import url(mac.css); --></STYLE>');
	} 
	else {
	//windows or unix
	if (navigator.appName.indexOf('Microsoft') > -1) {
		//explorer
		document.write('<LINK HREF="win.css" REL="styleSheet" TYPE="text/css">');
	}
	else {
		//netscape
		document.write('<LINK HREF="win.css" REL="styleSheet" TYPE="text/css">');
	}
}