window.addEvent('domready', function() {
  // switch css-styles to js mode - nice and clean non-destructive hack
  document.body.className = "jsact";

  var teasers = $$('.teaser');
  for ($i=0; $i<teasers.length; $i++) {
    teasers[$i].parentNode.onclick = function() {
      toggle(this, 'act');
    };
  }
});

function toggle(el, className) {
  el = $(el);
  var cur = el.parentNode.firstChild;
  do {
    if(cur == el && cur.className != className) {
      cur.className = className;
    } else {
      cur.className = "";
    }
  } while (cur = cur.nextSibling);
}