Paypal open iframe with pretty photo?

[savantstyles]

Is it possible to open the Paypal Payment with prettyphoto(lightbox alternative)?

I know I can add the rel="prettyPhoto" and add "?iframe=true&width=960&height=550" to the url. Where exactly do I put this in the hard code? The generator spits out:

<form action="https://www.paypal.com/cgi-bin/webscr" method="post">
<input type="hidden" name="business" value="mathelme@yahoo.com" />
<input type="hidden" name="cmd" value="_xclick-subscriptions" />
<!-- Instant Payment Notification & Return Page Details -->
<input type="hidden" name="notify_url" value="http://site.com/?s2member_paypal_notify=1" />
<input type="hidden" name="cancel_return" value="http://site.com" />
<input type="hidden" name="return" value="http://site.com/?s2member_paypal_return=1" />
<input type="hidden" name="rm" value="2" />
<!-- Configures All Of The Checkout Fields -->
<input type="hidden" name="no_shipping" value="1" />
<input type="hidden" name="no_note" value="1" />
<input type="hidden" name="custom" value="site.com" />
<input type="hidden" name="currency_code" value="USD" />
<input type="hidden" name="page_style" value="paypal" />
<input type="hidden" name="item_name" value="Bride" />
<input type="hidden" name="item_number" value="1" />
<!-- Identifies/Updates An Existing Member After Checkout -->
<input type="hidden" name="on0" value="<?php echo S2MEMBER_CURRENT_USER_VALUE_FOR_PP_ON0; ?>" />
<input type="hidden" name="os0" value="<?php echo S2MEMBER_CURRENT_USER_VALUE_FOR_PP_OS0; ?>" />
<input type="hidden" name="modify" value="0" />
<!-- Customizes Prices, Payments & Billing Cycle -->
<!--<input type="hidden" name="amount" value="0.01" />-->
<input type="hidden" name="src" value="1" />
<input type="hidden" name="sra" value="1" />
<!--<input type="hidden" name="a1" value="0.00" />-->
<!--<input type="hidden" name="p1" value="0" />-->
<!--<input type="hidden" name="t1" value="D" />-->
<input type="hidden" name="a3" value="0.01" />
<input type="hidden" name="p3" value="1" />
<input type="hidden" name="t3" value="M" />
<!-- Displays The PayPal® Image Button -->
<input type="image" alt="Pay Now" style="border:0;" src="http://site.com/wp-content/uploads/2010/09/sign-up-month.png" />
</form>

**If you could help me it would be greatly appreciated. Thank you all!

-SS