FoxyShop: Subscription as a Variation Setup

//This is a way to allow your customers to select their subscription frequency
//Create a dropdown variation called "Delivery Frequency" and then create a hidden input as seen below for each of the entries
//This code goes in foxyshop-single-product.php before the end of the form

//CUSTOM SUBSCRIPTION CODE HERE
echo '<input type="hidden" name="x:sub_frequency1" id="frequency_holder1_' . $product['id'] . '" value="sub_frequency' . foxyshop_get_verification("sub_frequency", "1m") . '" />'."\n";
echo '<input type="hidden" name="x:sub_frequency2" id="frequency_holder2_' . $product['id'] . '" value="sub_frequency' . foxyshop_get_verification("sub_frequency", "2m") . '" />'."\n";
echo '<input type="hidden" name="x:sub_frequency3" id="frequency_holder3_' . $product['id'] . '" value="sub_frequency' . foxyshop_get_verification("sub_frequency", "3m") . '" />'."\n";

//Writes Javascript
?>
<script type="text/javascript">
jQuery(document).ready(function($) {
    $("select.variation-delivery-frequency").bind("change ready", function() {
        var currentval = $(this).prop("selectedIndex");
        var product_id = $(this).parents("form").attr("id");
        product_id = product_id.replace("foxyshop_product_form_","");
        setFrequency(currentval, product_id);
    });
    function setFrequency(fr, product_id) {
        fr++;
        $("#fs_sub_frequency_" + product_id).val(fr+"m").attr("name",$("#frequency_holder" + fr + "_" + product_id).val());
    }
    //Run on Initialization
    $("select.variation-delivery-frequency").each(function() {
        var currentval = $(this).prop("selectedIndex");
        var product_id = $(this).parents("form").attr("id");
        product_id = product_id.replace("foxyshop_product_form_","");
        setFrequency(currentval, product_id);
    });
});
</script>
<?php