function afficher(element){document.getElementById(element).style.display = "block";}
function cacher(element){document.getElementById(element).style.display = "none";}

function donner_focus(chp) {document.getElementById(chp).focus();}

function showhide(thingId) {
	var targetElement;
	targetElement = document.getElementById(thingId) ;
	if (targetElement.style.display == "none") {
		targetElement.style.display = "block" ;
	} else {
		targetElement.style.display = "none" ;
	}
}