function visibilite(thing1, thing2, thing3)
{
	var elem1, elem2, elem3, elem4, elem5;
	elem1 = document.getElementById(thing1) ;
	elem2 = document.getElementById(thing2) ;
	elem3 = document.getElementById(thing3) ;

	elem1.style.display = "" ;
	elem2.style.display = "none" ;
	elem3.style.display = "none" ;
}