the id being assigned to the item when adding it to the cart must be a whole number grater than 0:
change:
<input type="hidden" name="cupcake1_2_ID_Add2" value="0" />
to:
<input type="hidden" name="cupcake1_2_ID_Add2" value="10" />
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.