function print_box(v)
{
   for(cpt=1; cpt<=4; cpt++)
   {
      var box = document.getElementById("box"+cpt);
      box.style.display = "none";   
   }
   var box = document.getElementById("box"+v);
   box.style.display = "block";
}

function del_box()
{
   for(cpt=1; cpt<=4; cpt++)
   {
      var box = document.getElementById("box"+cpt);
      box.style.display = "none";   
   }
}