Sounds like you just want to add a product options pull-down menu under the specific product options. This would be way easier, more efficient (no extra sql calls) and it will automatically pass the options to your order data so it's included in the email receipt. It's very easy if you just follow the javascript example included in the admin product modification interface. We did this with some state-specific products to allow users to specify which version/state they need. You can see this here:
http://www.realestate-school.com/online-store/customer/product.php?productid=40
Just try adding to cart without selecting a state and see what happens. This javascript was all added as a product option for the specific product and is stored in the database with the product. Works great for us and required no cart mods.
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www.brettbrewer.com
Getting back into x-cart dev after a long hiatus. Modded lots of x-carts from version 3.1.x to 4.1.x. Developer of ImageScaler mod, Pre-login per user coupon mod, Wordpress feed mod, DigitalSubscriptions mod, Phonetic bulk download keys addon for DownloadExpander mod, Serial Number Generator for ESD products, Custom CMS/LMS integrations, external products mod, and more.
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