window.onload = montre;
var opened = false;
function montre(id) {
   for (var i = 1; i<=10; i++) {
      if (document.getElementById('smenu'+i)) {
         document.getElementById('smenu'+i).style.display='none';
      }
   }
   var d = document.getElementById(id);
   if (d) {
      if(opened == d) {
         opened = false;
         d.style.display='none';
      } else {
         opened = d;
         d.style.display='block';
      }
   }
}