function bascule_affichage_div(id_div){
	var div = document.getElementById(id_div);
	var ancre = document.getElementById("ancre_"+id_div);
	if(div.className=="afficher_div")
	{
		div.className = "cacher_div";
		changeText(ancre, "dérouler");
	}
	else
	{
		div.className = "afficher_div";
		changeText(ancre, "enrouler");
	}
}

function changeText(obj, newText){
	if (obj.innerText)
		obj.innerText = newText;
	else if (obj.firstChild && obj.firstChild.nodeValue)
		obj.firstChild.nodeValue = newText;
}