function hideLayer( name ){

  if (document.getElementById)
  {
     document.getElementById(name).style.visibility='hidden';
  }
  else if (document.all)
  {
     document.all[name].style.visibility='hidden';
  }
  else if (document.layers)
  {
     document.layers[name].visibility='hidden';
  }
  else{ 

	}
}

function showLayer( name ){

  if (document.getElementById)
  {
     document.getElementById(name).style.visibility='visible';
  }
  else if (document.all)
  {
     document.all[name].style.visibility='visible';
  }
  else if (document.layers)
  {
     document.layers[name].visibility='visible';
  }
  else{ 

	}
}