var verStr=navigator.appVersion, app=navigator.appName, version = parseFloat(verStr), uA = navigator.userAgent;

bOK = false;
/*
alert (verStr);
alert (app);
alert (version);
*/

if (verStr.indexOf("Windows")!=-1) {
	//alert ("OS is Windows");
	if ((app.indexOf('Microsoft') != -1) && (uA.indexOf("Opera")==-1)) {
		//alert ("IE but not Opera");
		var IEversion = parseFloat(verStr.substr(verStr.indexOf("MSIE")+"MSIE".length));
		if (IEversion >= 4) bOK = true;
	}
	if (app.indexOf('Netscape') != -1) {
		//alert ("Netscape");
		if ((version >= 4) && (version <= 5.78)) bOK = true;
	}
}
if (verStr.indexOf("Mac")!=-1) {
	//alert ("OS is Mac");
	if (app.indexOf('Netscape') != -1) {
		//alert ("Netscape");
		if ((version >= 4) && (version <= 5.78)) bOK = true;
	}
}

//alert (bOK);
if (!bOK) location.href="platforms.html";