function groot(afb) {
	var w = 600;
	var h = 600;
	var l = (screen.width - w) / 2;
    var t = (screen.height - h) / 2;
	grootWindow = window.open('afb/' + afb,'groot','toolbar=0,location=0,directories=0,status=1,menubar=0,scrollbars=1,resizable=1,width=' + w + ',height=' + h + ',copyhistory=0,left=' + l + ',top=' + t + ',screenX=' + l + ',screenY=' + t);
	if (grootWindow != null) grootWindow.focus();
}