// JavaScript Document
 function show(id)
 {
   var layer=document.getElementById(id);
   layer.style.visibility="visible";
   
  /* var layer1=document.getElementById(id1);
   layer1.style.visibility="hidden";
   var layer2=document.getElementById(id2);
   layer2.style.visibility="hidden";*/
 }
 
 function hide(id1)
 {
   var layer1=document.getElementById(id1);
   layer1.style.visibility="hidden";
   /*var layer2=document.getElementById(id2);
   layer2.style.visibility="hidden";
    var layer3=document.getElementById(id3);
   layer3.style.visibility="hidden"; */    
  }