<input type="text" name="coupon_code" value="{$cart->coupon->code|escape}" class="coupon_code"> %
<select name="coupon_code" class="styled">
<option value="8"{if $cart->coupon->code == '8'} selected{/if}> Скидка 8% </option>
<option value="15"{if $cart->coupon->code == '15'} selected{/if}>Скидка 15% </option>
<option value="20"{if $cart->coupon->code == '20'} selected{/if}>Скидка 20% </option>
</select>