function rollover(name,over)
{
  if(window.document.images) 
  {
    if (over)
      window.document.images[name].src = "images/" + name + "-over.gif";
    else
      window.document.images[name].src = "images/" + name + ".gif";
  }
}

function trigger(name,image,over)
{
  if(window.document.images) 
  {
    if (over)
      window.document.images[name].src = "images/" + image + "-over.gif";
    else
      window.document.images[name].src = "images/" + image + ".gif";
  }
}