function update_qte(elt, value)
{
	var obj = document.getElementById(elt);
	if (Number(value) == -1)
	{
		if(Number(obj.value) != 1)
			obj.value = Number(obj.value) + Number(value);
	}
	else
		obj.value = Number(obj.value) + Number(value);
	document.form1.submit();
}