function addListeners() {
  var links = $$('a');
  links.each(function(link) {
    if (link.rel=='popup')
      Event.observe(link, 'click', popmeup);
  });
}

function popmeup(e) {
  window.open(Event.element(e).href, 'popup', 'width=590,height=600,menubar=no,toolbar=no,resizable=yes,scrollbars=yes');
  Event.stop(e);
}

//Event.observe(window, 'load', addListeners);