function popupOdkazy() {
  if (!document.getElementsByTagName) return false;
  var links = document.getElementsByTagName("a");
  for (var i=0; i < links.length; i++) {
    if (links[i].className.match("pop")) {
      links[i].onclick = function() { return !window.open(this.href); }
    }
  }  return true;
}
window.onload = popupOdkazy;