function visibilite(thingId, thingId2, btn1, btn2)
{
var targetElement;
var targetElement2;
targetElement = document.getElementById(thingId) ;
targetElement2 = document.getElementById(thingId2) ;
targetClass = document.getElementById(btn1) ;
targetClass2 = document.getElementById(btn2) ;

targetElement2.style.display = "none" ;
targetElement.style.display = "" ;
targetClass2.className="none";
targetClass.className="active";

}