function initRollover (elem, extra) {
  
  if (document.images) {
    var nameString = elem.name;
    eval (nameString + 'Active = new Image ()');
    eval (nameString + 'Active.src = "/images/topmenu/" + nameString + "_highlight" + extra + ".gif"');
    eval (nameString + 'Passive = new Image ()');
    eval (nameString + 'Passive.src = "/images/topmenu/" + nameString + extra + ".gif"');
  }

}


function rolloverActive (elem, extra) {

  if (document.images) {
    var nameString = elem.name;
    eval ('document.images.' + nameString + '.src = ' + nameString + 'Active.src');
  }

}


function rolloverPassive (elem, extra) {

  if (document.images) {
    var nameString = elem.name;
    eval ('document.images.' + nameString + '.src = ' + nameString + 'Passive.src');
  }

}