mac=(navigator.appVersion.indexOf('Mac')!=-1)?true:false;

if(mac){
	//mac
	document.write('<link rel= "stylesheet" href="../../css/org_mac_2.css" type="text/css">');
	} 
else{
	//win
	document.write('<link rel= "stylesheet" href="../../css/org_win_2.css" type="text/css">');
}