if (navigator.userAgent.indexOf("Win") >= 0) {

	if (navigator.appName.indexOf("Microsoft") >= 0) {
		version="win_ie";
	} 
	else{
		if(navigator.appVersion.charAt(0) == 5){
			version="win_nn6";
		}
		else {
				if(navigator.appVersion.charAt(0) >= 6){
							version="win_nn7";
				}
				else{
			    version="win_nn";
                }
  		}
	}

}
else {
	if (navigator.userAgent.indexOf("Safari") != -1) {
		version="mac_safari";
	}
	else {
			if (navigator.appName.indexOf("Microsoft") >= 0) {
			version="mac_ie";
				
			}else {
					if(navigator.appVersion.charAt(0) >= 5){
						version="mac_nn6";
					}
					else {
						version="mac_nn";
					}
			}
	}
}
document.write('<LINK REL="stylesheet" TYPE="text/css" HREF="css/'+version+'.css">')