function popupWindow(url, id, w, h, features) {
	var s = (w ? ("width=" + w) : "") + (h ? (",height=" + h) : "");
	var ss = new Array ("menubar", "toolbar", "location", "scrollbars", "status", "resizable");
	if (features) for (i in ss) s += "," + ss [i] + "=" + features.charAt (i);
	var o = window.open(url, id, s);
	o.focus();
}