function open_window(url, width, height) {
	var mywin=window.open(url,"","toolbar=no,directories=no,status=no,menubar=no,resizable=no,scrollbars=no,location=no,width=" + width + ",height=" + height);
	mywin.moveTo((screen.availWidth - width) / 2,(screen.availHeight - height) / 2);
}

function open_window_scroll(url, width, height) {
	var mywin=window.open(url,"","toolbar=no,directories=no,status=no,menubar=no,resizable=no,scrollbars=yes,location=no,width=" + width + ",height=" + height);
	mywin.moveTo((screen.availWidth - width) / 2,(screen.availHeight - height) / 2);
}