function Is() {
		var agent = navigator.userAgent.toLowerCase();
		this.ns = ((agent.indexOf('mozilla')!=-1) && ((agent.indexOf('spoofer')==-1) && (agent.indexOf('compatible') == -1)));
		this.mac = (agent.indexOf("mac") != -1);
	}
	
	var is = new Is();
	if(is.ns) { // Netscape
		var ji = ('<link rel="stylesheet" type="text/css" href="css/ji.css" title="style" media="screen" />');
	} 
	else if (!is.mac) { // IE PC
		var ji = ('<link rel="stylesheet" type="text/css" href="css/ji_ie.css" title="style" media="screen" />');
	}
	else {// IE mac
		var ji = ('<link rel="stylesheet" type="text/css" href="css/ji_ie_mac.css" title="style" media="screen" />') 
	}
document.write(ji);