function changemenu(rub)
{
	if (document.getElementById('menug'+rub))
		DisplayHide('dvimenu', 'menug'+rub);
	if (document.getElementById('menud'+rub))
		DisplayHide('dvimenud', 'menud'+rub);
}
/****** MASQUER TOUS LES DIV ET AFFICHER CELUI REFERENCE PAR id ******/

function getElementsByClassName(className, tag, elm){
	var testClass = new RegExp("(^|s)" + className + "(s|$)");
	var tag = tag || "*";
	var elm = elm || document;
	var elements = (tag == "*" && elm.all)? elm.all : elm.getElementsByTagName(tag);
	var returnElements = [];
	var current;
	var length = elements.length;
	for(var i=0; i<length; i++){
		current = elements[i ];
		if(testClass.test(current.className)){
			returnElements.push(current);
		}
	}
	return returnElements;
}

function DisplayHide(clas, id){
var i;

	var lay=document.getElementById(id);
	var list_lay=getElementsByClassName(clas,'div');
	lay.style.display='block';
	for(i=0;i<list_lay.length;i++)
		list_lay[i].style.display='none';
	lay.style.display='block';
}

/****	Affichage diapo accueil	***/
var id=0;

function AfficherImg(total){
	var delai=3000;
	var i;
	
	MasquerTout(total);
	for(i=0;i<4;i++)
	{
		if (id==total) id=1;
		else  id++;
		AfficherDiv(id);
		
	}setTimeout(function(){AfficherImg(total)},delai);
	 
	
}
/****** MASQUER TOUS LES DIV  ****/
function MasquerTout(total)
{
	var i;
	for(i=1; i<=total; i++)
	{
		if (document.getElementById('diapo'+i))//undefined
		with(document.getElementById('diapo'+i).style)
			display='none';
	}
}
/******  AFFICHER LE DIV  id ******/
function AfficherDiv(id)
{
	
	if (document.getElementById('diapo'+id))//undefined
		with(document.getElementById('diapo'+id).style)
			display='block';
	
}