var _POPUP_FEATURES = 'location=1, statusbar=1, menubar=1, toolbar=1, resizeable=1, scrollbars=1, width=800, height=600';

function raw_popup(url, target, features) {
  if (isUndefined(features)) {
    features = _POPUP_FEATURES;
  }
  if (isUndefined(target)) {
    target = '_blank';
  }
  var theWindow =
    window.open(url, target, features);
  theWindow.focus();
  return theWindow;
}

function link_popup(src, features) {
	return raw_popup(src.getAttribute('href'), src.getAttribute('target') || '_blank', features);
}

function event_popup(e) {
  link_popup(e.currentTarget);
  e.preventDefault();
}

addLoadEvent(
	function allowPopups() { 
		addEvent(getElementsByClassName('popup', 'a'), 'click', event_popup) ;
	}
);