function increment(id_chps, mini, incr){
	var champs = document.getElementById(id_chps);
    if (champs.value == "" || champs.value == "0" || isNaN(champs.value)) {
        champs.value = mini;
    }
    else {
        champs.value = Number(champs.value) + incr;
    }
}

function decrement(id_chps, mini, incr){
	var champs = document.getElementById(id_chps);
    if (champs.value == "" || champs.value == "0" || champs.value == mini || isNaN(champs.value)) {
        champs.value = 0;
    }
    else {
        champs.value = champs.value - incr;
    }
}

function maj_pan(id, qt){
    parent.panier.location.href = "liste_panier.asp?aff=chef&ajout=1&id=" + id + "&qt=" + qt;
}