var NS4 = (document.layers) ? 1 : 0;
var IE4 = (document.all) ? 1 : 0;
function netie(net, ie) {
if ((navigator.appVersion.substring(0,3) >= net && navigator.appName == 'Netscape' && net != -1) || (navigator.appVersion.substring(0,3) >= ie && navigator.appName.substring(0,9) == 'Microsoft' && ie != -1))
return true;
else return false;
}