Update nav.html

<a href="https://www.thegiftcardcafe.com/cart/index.php?storeID=7679" target="_blank">Buy a Gift Certificate!</a><form name="giftcart" method="post" target="_blank" action="https://www.thegiftcardcafe.com/cart/index.php?storeID=7679">
<input name="Submit" type="submit" value="Buy Gift Certificate Now!"></form>