function showlayer(Layer_Name)
{
  var GECKO = document.getElementById? 1:0 ;
  var NS = document.layers? 1:0 ;
  var IE = document.all? 1:0 ;

  if (GECKO)
       {document.getElementById(Layer_Name).style.display= 'block'}
  else if (NS)
       {document.layers[Layer_Name].display='block' }
  else if (IE)
       {document.all[Layer_Name].style.display='block'}
}

function hidelayer(Layer_Name)
{
  var GECKO = document.getElementById? 1:0 ;
  var NS = document.layers? 1:0 ;
  var IE = document.all? 1:0 ;

  if (GECKO)
       {document.getElementById(Layer_Name).style.display= 'none'}
  else if (NS)
       {document.layers[Layer_Name].display='none' }
  else if (IE)
       {document.all[Layer_Name].style.display='none'}
}