function openPopup(url, width, height) {
	if (width == undefined) 	width = 400;
	if (height == undefined) 	height = 300;

	var newwindow = window.open(url,'extern','width=' + width + ',height=' + height + ',scrollbars=1,resizable=1');
	if (window.focus) {
		newwindow.focus();
	}
	return false;
}