function addHighSlideAttribute() {
  var isIE = (document.documentElement.getAttribute('style') ==
              document.documentElement.style);
  var anchors = document.getElementById('content').getElementsByTagName('a');
  for (var i = 0, len = anchors.length; i < len; i++) {
    if (anchors[i].className == 'highslide') {
      if (!anchors[i].getAttribute('onclick')) {
        isIE ? anchors[i].setAttribute('onclick', new Function('return hs.expand(this)')) :
               anchors[i].setAttribute('onclick','return hs.expand(this)');
        isIE ? anchors[i].setAttribute('onkeypress', new Function('return hs.expand(this)')) :
               anchors[i].setAttribute('onkeypress','return hs.expand(this)');
      }
    }
  }
}