function visibilite(thingId) 
{ 
  var i; 
  var targetElement; 
  for(i=1; i<=10; i++){ 
    targetElement = document.getElementById("gyo" + i) ; 
    targetElement.style.display = "none" ; 
  } 
  targetElement = document.getElementById("gyo" + thingId) ; 
  targetElement.style.display = "" ; 
}