browser_version= parseInt(navigator.appVersion);
browser_type = navigator.appName;

if ((navigator.userAgent.indexOf("Mac") != -1) && (navigator.userAgent.indexOf("MSIE 5")==-1)){
	document.write('<LINK REL="stylesheet" HREF="css/mac.css" TYPE="text/css">');
} else {
	if (navigator.appName.indexOf('Microsoft') > -1) {
		document.write('<LINK REL="stylesheet" HREF="css/win_ie.css" TYPE="text/css">');
	} else if(browser_type == "Netscape" && (browser_version >= 5)){
		document.write('<LINK REL="stylesheet" HREF="css/win_ns_5.css" TYPE="text/css">');
	} else {
		document.write('<LINK REL="stylesheet" HREF="css/win_ns.css" TYPE="text/css">');
	}
}