function interceptClicks() {
  if (document.getElementsByTagName) {
    var links = document.getElementsByTagName("a");
    for (var i=0; i < links.length; i++) {
      if (links[i].className.match("img1") || links[i].className.match("img2") || links[i].className.match("img3") || links[i].className.match("img4") || links[i].className.match("img5") || links[i].className.match("img6")) {
        links[i].onclick = function() {
          return false;
        };
      }
    }
  }
}