function rollon()
{
  var e = window.event.srcElement;
  if (e.className == "whitelink" || e.className == "bluelink")
  {
    e.style.textDecoration = 'underline'; // change class
  }
}

function rolloff()
{
  var e = window.event.srcElement;
  if (e.className == "whitelink" || e.className == "bluelink")
  {
    e.style.textDecoration = 'none'; // change class
  }
}

// assign rollon() to handle onMouseOver events
document.onmouseover = rollon;

// assign rolloff() to handle onMouseOut events
document.onmouseout = rolloff;