var isNS4mac = 0;
var isNS4pc = 0;
var isNS5mac = 0;
var isNS5pc = 0;
var isIE4mac = 0;
var isIE4pc = 0;
var isIE5mac = 0;
var isIE5pc = 0;
var sys, soft, num, platform

if (navigator.appVersion.indexOf("Mac") != -1) {sys = "mac";}
	else {sys = "pc";}

if (navigator.appName.indexOf("Netscape") != -1) {soft = "NS";}
	else {soft = "IE";}

if ((navigator.appVersion.indexOf("MSIE 5") != -1) || (parseInt(navigator.appVersion) >= 5)) {num = "5";}
	else {num = "4";}

var brow = (soft + num + sys);

if (brow == "NS4mac") {isNS4mac = 1;}
	else if (brow == "NS4pc") {isNS5pc = 1;}
		else if (brow == "NS5mac") {isNS5mac = 1;}
			else if (brow == "NS5pc") {isNS5pc = 1;}
				else if (brow == "IE4mac") {isIE4mac = 1;}
					else if (brow == "IE4pc") {isIE5pc = 1;}
						else if (brow == "IE5mac") {isIE5mac = 1;}
							else if (brow == "IE5pc") {isIE5pc = 1;}

if (isNS4mac||isNS4pc||isNS5mac||isNS5pc||isIE4mac||isIE4pc||isIE5mac||isIE5pc) {
	platform = (isNS4pc) ? 'pc' :  (isNS5mac) ? 'pc' :  (isNS5pc) ? 'pc' :  (isIE4pc) ? 'pc' :  (isIE5mac) ? 'pc' :  (isIE5pc) ? 'pc' : 'mac';
	}