function rubberText(id, start, finish, step, speed)
{
 if (start < finish)
  { 
   var el = document.getElementById("expand");
   el.style.letterSpacing = start + "px";  
   start = start + step; 
   setTimeout("rubberText('"+id+"',"+start+","+finish+","+step+","+speed+")",speed);
  }	
}