var bPass = true;

// firefox 1.5 or above allowed only
if(navigator.userAgent.indexOf("Firefox")!=-1){
var versionindex=navigator.userAgent.indexOf("Firefox")+8
if (parseInt(navigator.userAgent.charAt(versionindex)) < 1.5)
	bPass = false;
}

// ie 1.0 or above allowed only
version=0
if (navigator.appVersion.indexOf("MSIE")!=-1){
temp=navigator.appVersion.split("MSIE")
version=parseFloat(temp[1])
if (version < 1.5) //NON IE browser will return 0
	bPass = false;
}


// send to upgrade page if old browser
if(!bPass)
	document.location.href='upgrade.htm';