FoxyShop: Quantity Range Dropdown

//Ranged dropdowns - put this in your functions.php file
add_action('foxyshop_admin_product_details','my_custom_product_details');
function my_custom_product_details($post_id) {

    $fieldname = "_dropdown_qty"; //has to start with _
    $fieldescription = "Qty Groups";
    ?>
    <div style="clear:both"></div>
    <div class="foxyshop_field_control">
        <label for="<?php echo $fieldname; ?>"><?php echo htmlspecialchars($fieldescription); ?></label>
        <input type="text" name="<?php echo $fieldname; ?>" id="<?php echo $fieldname; ?>" value="<?php echo htmlspecialchars(get_post_meta($post_id, $fieldname, 1)); ?>" />
    </div>
    <div style="clear:both"></div>
    <?php




}
add_action('foxyshop_save_product','my_save_custom_product_details');
function my_save_custom_product_details($post_id) {

    //Enter All of Your Field Names in an array
    $fieldnames = array('_dropdown_qty');

    foreach ($fieldnames as $fieldname) {
        $fieldvalue = isset($_POST[$fieldname]) ? $_POST[$fieldname] : '';
        foxyshop_save_meta_data($fieldname, $fieldvalue);
    }

    return $post_id;
}
function my_foxyshop_qty() {
    global $product;
    $dropdown_qty = get_post_meta($product['id'], '_dropdown_qty', 1);
    if (!$dropdown_qty) {
        foxyshop_quantity();
        return;
    }

    $arr_dropdown = explode(",", $dropdown_qty);

    $quantity_title = apply_filters("foxyshop_quantity_title", "Quantity");
    echo '<label class="foxyshop_quantity" for="quantity_' . $product['id'] . '">' . $quantity_title . '</label>'."\n";
    echo '<select class="foxyshop_quantity" name="quantity">';
    for ($i = 0; $i < count($arr_dropdown); $i++) {
        $val = trim($arr_dropdown[$i]);
        echo '<option value="' . $val . foxyshop_get_verification('quantity',$val) . '">' . $val . '</option>' . "\n";
    }
    echo '</select>'."\n";
    echo '<div class="clr"></div>';

}