<form name="form_6UZA1" method="POST"
                    action="cart/cart.add" >
                    <div class="qtyLabel-list">
                        Qty: <input name="qty" type="text" value="1" />
                    </div>
                    <input type="hidden" name="item_and_qty" />
                    <input type="submit" value="add to order" class="addToOrderBtn" onsubmit="function(){ document.getElementByName('item_and_qty').value = '6UZA1:' + document.form_6UZA1.qty.value;}" />
                </form>