// make popup windows
function spinOff(target_url, win_name, target_width, target_height, scrolling_option) {
	if (top.offspring && !top.offspring.closed) {top.offspring.close();}
	top.offspring = window.open(target_url, win_name, "location=no,resizable=no,width=" + target_width + ",height=" + target_height + ",scrollbars=" + scrolling_option);
}