var pop = null;
 
function popupClose() {
	try {
		if (!pop) return;
		if (typeof (pop) == 'undefined') return;
		if (typeof (pop.closed) == 'undefined') return;
		if (!pop.closed) pop.close();
	} catch(err) {}
	pop = null;
}
			
			
function popupOpen(obj,w,h) {
  var url = (obj.getAttribute) ? obj.getAttribute('href') : obj.href;
  if (!url) return true;
  w = (w) ? w += 20 : 150;  // 150px*150px is the default size
  h = (h) ? h += 25 : 150;
  var args = 'width=' + w + ',height=' + h + ',resizable,scrollbars=yes';
  popupClose();
  pop = window.open(url,'',args);
  return (pop) ? false : true;
}

window.onunload = popupClose;
window.onfocus = popupClose;