function showPromo(iPromoId){

	var div = document.getElementById("div_promo_"+iPromoId);
	if(div){
		div.style.display = 'block';
	}
	var command = document.getElementById("button_promo_"+iPromoId);
	if(command){
		command.alt = '-';
		command.src = imgMoins;
	}

}

function hidePromo(iPromoId){

	var div = document.getElementById("div_promo_"+iPromoId);
	if(div){
		div.style.display = 'none';
	}
	var command = document.getElementById("button_promo_"+iPromoId);
	if(command){
		command.alt = '+';
		command.src = imgPlus;
	}

}

function isOpenPromo(iPromoId){
	var div = document.getElementById("div_promo_"+iPromoId);
	if(div){
		return div.style.display == 'block';
	}
	return false;
}

function getLastOpen(iPromoId){

	promo = iPromoId;
	while(!isOpenPromo(promo)&&promo>=0){
		promo--;
	}
	return promo;
}

function getNbOpen(){

	var cpt = 0;
	for(i=1;i<=nbPromos;i++){
		if(isOpenPromo(i)){
			cpt++;
		}
	}
	return cpt;

}


function clickPromo(iPromoId){

	if(!isOpenPromo(iPromoId)){
		if(getNbOpen()>=nbDefault){
			hidePromo(getLastOpen(nbPromos));
		}
		showPromo(iPromoId);

	}
	else{
		
		hidePromo(iPromoId);

	}

}

function initPromos(){

	for(i=0;i<=nbDefault;i++){
		showPromo(i);
	}

}