var browser = navigator.appName;
    var browser_version=parseInt(navigator.appVersion);

    if (navigator.appVersion.indexOf("Mac") > 0) {
	if ((browser == "Microsoft Internet Explorer")&&(navigator.appVersion.substring(22,23)>4)) {
    		document.write("<link rel=stylesheet type=text/css href=/css/css_win_ie.css>");
    		}
    	else if (browser == "Microsoft Internet Explorer") {
    		document.write("<link rel=stylesheet type=text/css href=/css/css_mac_ie.css>");
    		}
    	else if (browser == "Netscape") {
    		document.write("<link rel=stylesheet type=text/css href=/css/css_mac_nn.css>");
    		}
	}
    else if (browser == "Microsoft Internet Explorer") {
    document.write("<link rel=stylesheet type=text/css href=/css/css_win_ie.css>");
    }
    else if (browser == "Netscape" && browser_version >=5) {
    	 document.write("<link rel=stylesheet type=text/css href=/css/css_win_nn.css>");
    }
    else if (browser == "Netscape") {
    	document.write("<link rel=stylesheet type=text/css href=/css/css_win_nn.css>");
    }
    else  {
    document.write("<link rel=stylesheet type=text/css href=/css/css_mac_nn.css>");
    }