function hideButFirst() {
  var a = document.getElementsByTagName("a");

  var i = 0;
  var j = 0;
  for (x=0; x<a.length; x++) {
    var rel = String(a[x].getAttribute('rel'));
    var includes = rel.match(/lightbox\[lb([0-9]+)/);
    if (includes) {
      i = parseInt(includes[1]);
      if (i == j) {
        a[x].style.display = "none";
        a[x].style.visibility = "hidden";
      } else {
        j = i;
      }
    }
  }
}

addEvent(window,'DOMContentLoaded', hideButFirst);