var base ="/common/css/common.css";
var n4 = "/common/css/n4.css";

var cssfile;
if((document.all) && (navigator.userAgent.indexOf("Win") >= 0)){
	cssfile = base;
}else if((document.all) && (navigator.userAgent.indexOf("Mac") >= 0)){
	cssfile = base;
}else if(document.layers){
	cssfile = n4;
}else if(document.getElementById){
	cssfile = base;
}else{
	cssfile = base;
}

document.write('<link rel=stylesheet HREF="'+ cssfile +'" type="text/css">');