function OpenLayer(id){
   if(document.getElementById(id).style.display == "block") {
    document.getElementById(id).style.display = "none" ;

   } else {
    document.getElementById(id).style.display = "block" ;

   }
   window.status =  document.getElementById(id).style.display;
 }

 function BasculeLayer(id1,id2){
   if(document.getElementById(id1).style.display == "block") {
    document.getElementById(id1).style.display = "none" ;

   } else {
    document.getElementById(id1).style.display = "block" ;

   }
   window.status =  document.getElementById(id1).style.display;

   if(document.getElementById(id2).style.display == "block") {
    document.getElementById(id2).style.display = "none" ;

   } else {
    document.getElementById(id2).style.display = "block" ;

   }
   window.status =  document.getElementById(id2).style.display;

 }

 function Bascule4Layer(id1,id2,id3,id4){
   document.getElementById(id1).style.display = "block" ;
   window.status =  document.getElementById(id1).style.display;

   document.getElementById(id2).style.display = "none" ;
   window.status =  document.getElementById(id2).style.display;

   document.getElementById(id3).style.display = "none" ;
   window.status =  document.getElementById(id3).style.display;

   document.getElementById(id4).style.display = "none" ;
   window.status =  document.getElementById(id4).style.display;
 }