FoxyShop: Dropdown for adding a subscription

//This code goes in foxyshop-single-product.php in the custom code section
?>
<script type="text/javascript">
jQuery(document).ready(function($){
    $(".variation-payment-type").change(function() {
        update_payment_options();
    });

    //Set Defaults
    $("#fs_sub_frequency_<?php echo $product['id']; ?>").attr("name", "sub_frequency<?php echo foxyshop_get_verification("sub_frequency", "--OPEN--"); ?>");
    $("#fs_sub_enddate_<?php echo $product['id']; ?>").attr("name", "sub_enddate<?php echo foxyshop_get_verification("sub_enddate", "--OPEN--"); ?>");
    update_payment_options();
});
function update_payment_options() {
    var current_payment_option = $("select.variation-payment-type").val();
    if (current_payment_option.match(/Buy Now/gi)) {
        $("#fs_sub_frequency_<?php echo $product['id']; ?>").val("");
        $("#fs_sub_enddate_<?php echo $product['id']; ?>").val("");
    }
    if (current_payment_option.match(/3 Month/gi)) {
        $("#fs_sub_frequency_<?php echo $product['id']; ?>").val("3m");
        $("#fs_sub_enddate_<?php echo $product['id']; ?>").val("<?php echo date('Y-m-d', strtotime('+2 months +25 days')); ?>");
    }
    if (current_payment_option.match(/6 Month/gi)) {
        $("#fs_sub_frequency_<?php echo $product['id']; ?>").val("6m");
        $("#fs_sub_enddate_<?php echo $product['id']; ?>").val("<?php echo date('Y-m-d', strtotime('+5 months +25 days')); ?>");
    }
}

</script>
<?php