mac=(navigator.appVersion.indexOf('Mac')!=-1)?true:false;
ie=(navigator.appName.charAt(0) == "M")?true:false;

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