var combo = document.getElementById("idtxtDocumentoTipo");
           var valor_fam = combo.value;

            var tabla = "<table border='4px'><tr>" +
            "<td>Nombre</td>" +
            "<td>ID articulo</td>" +
            "<td>Descripcion</td>" +
            "<td>Precio venta</td>" +
            "<td>Stock minimo</td>" +
            "<td>Proveedor</td>";

            // Generar tabla

            for (i = 0 ; i < articulo.length; i++ ) {

                if (valor_fam == articulo[i].nombre || valor_fam == "all") {

                tabla += "</tr><tr>";
                tabla += "<td>" + articulo[i].nombre + "</td>";
                tabla += "<td align=center>" + articulo[i].idarticulo + "</td>";
                tabla += "<td>" + articulo[i].descripcion + "</td>";
                tabla += "<td align=right>" + articulo[i].precioventa + " €</td>";
                tabla += "<td align=right>" + articulo[i].stockminimo + "</td>";
                tabla += "<td align=right>" + articulo[i].proveedor + "</td>";
            }
            }

            tabla += "</tr>";
            tabla += "</table>";