function switchlayer(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=

                   (document.getElementById(Layer_Name).style.display=='block') ? 'none' : 'block';}

  else if (NS)

       {document.layers[Layer_Name].display=(document.layers[Layer_Name].display==

                   'block') ? 'none' : 'block';}

  else if (IE)

       {document.all[Layer_Name].style.display=(document.all[Layer_Name].style.display==

                   'block') ? 'none' : 'block';}

}