Elena.Forester

Well, it sounds very strange but I need to move Voucher form from shopping-cart.tpl (site.com/order) page to the blockcart.tpl (it's a popup window which appears on "Add to cart" button click event). I've copied the form tpl code and it's ok. But now problem is about functionality: how need I edit ParentOrderController.php and blockcart.tpl to keep discount calculating in popup window? I mean that if I enter a code and then press OK then discount information should appear in this popup. Help me please, in which direction I need to see?