function updateField(tagada, field, num, valueconcat, valuemin, reinit) {
    var whichitem = 0;
    while (whichitem < document.forms[0].elements.length) {
    if (document.forms[0].elements[whichitem].value == num) {
        //window.alert(document.forms[0].elements[whichitem].name);
        valuebefore = parseInt(document.forms[0].elements[whichitem+1].value);
        namebefore = document.forms[0].elements[whichitem].name;
        if (valuebefore + parseInt(valueconcat) >= valuemin && (namebefore == 'articles['+num+']' || namebefore == 'items['+num+']')) {
            document.forms[0].elements[whichitem+1].value = valuebefore + parseInt(valueconcat);
        } else if (valuebefore == 0 && (namebefore == 'articles['+num+']' || namebefore == 'items['+num+']') && reinit != 1) {
            document.forms[0].elements[whichitem+1].value = valuemin;
        } else if (valuebefore == valuemin && (namebefore == 'articles['+num+']' || namebefore == 'items['+num+']') && reinit == 1) {
            document.forms[0].elements[whichitem+1].value = 0;
        } else if (reinit != 1) {
            window.alert('Vous avez atteint la quantité minimum de '+valuemin);
        }
    }
    whichitem++;
    }
}