function montreUne(){
        document.images["photo_alune"].src=tab_photo_alune[numUne].src;
		document.getElementById("tab_libelle_alaune").innerHTML = tab_libelle_alaune[numUne];
        document.getElementById("desc_alune").innerHTML = tab_desc_alaune[numUne];
        document.getElementById("lien_alune").href =tab_lien_alune[numUne];
        document.getElementById("num_alaune").innerHTML = (numUne+1);
}

function montreSuivUne() {
        numUne++;
        if(numUne >= tab_desc_alaune.length) {numUne =0;}
        montreUne();
}
function montrePrecUne() {
        numUne--;
        if(numUne < 0 ) {numUne =tab_desc_alaune.length-1;}
        montreUne();
	}

function montrePromo() {
        document.getElementById("libelle_promo").innerHTML = tab_libelle_promo[numPromo];
        document.getElementById("desc_promo").innerHTML = tab_desc_promo[numPromo];
        document.getElementById("prixRemise_promo").innerHTML = tab_prixRemise_promo[numPromo];
        document.getElementById("prixBarre_promo").innerHTML = tab_prixBarre_promo[numPromo];
        document.getElementById("lien_promo").href=tab_lien_promo[numPromo];

        document.images["photo_promo"].src=tab_photo_promo[numPromo].src;

        document.getElementById("num_promo").innerHTML = (numPromo+1);

	}
function montreSuivPromo() {
       numPromo++;
        if(numPromo >= tab_libelle_promo.length) {numPromo =0;}
        montrePromo();
       }
function montrePrecPromo() {
        numPromo--;
        if(numPromo < 0 ) {numPromo =tab_libelle_promo.length-1;}
        montrePromo();
	}