function erase(tb)
{
  var n;
  //alert(tb + ":" + s);

  if(tb == "search")
  {
    if(document.all)
    {
      document.all.ctl00$ctl00$m_cph$m_cph$a_tb.innerText = "";
    }
    else if(document.getElementById)
    {
      document.getElementById('ctl00$ctl00$m_cph$m_cph$a_tb').firstChild.nodeValue = "";
    }
  }
}