function popupScherm(src, w, h)
{
	var l = (screen.width-w)/2;
	var t = (screen.height-h)/2;
	if (l < 0) l = 0;
	if (t < 0) t = 0;
	var features = "height=" + h + ",width=" + w + ",top=" + t + ",left=" + l + ",resizable=1,scrollbars=1,toolbar=0";
	var remote = window.open(src, "popup", features);
	remote.focus();
}