function track(elem) { 
  document.getElementById(elem).style.display = "block";   // Iaiyai eii?aeiaou. 
  document.getElementById(elem).style.left = event.clientX+5;   // Iaiyai eii?aeiaou. 
  document.getElementById(elem).style.top = event.clientY-20;   // Iaiyai eii?aeiaou. 
}

function track_hide(elem) { 
  document.getElementById(elem).style.display = "none";   // Iaiyai eii?aeiaou. 
}