[Typo3-shop] paypal payment form can't work: nested forms!!

[stefano cecere]

sicne nested forms can't work.. please: how did you make a payment 
subform work?

the paypal button is indeed a subform:

<!-- ###MESSAGE_PAYMENT_20### begin
Message for payment method 20, Paypal
-->
<p><font color=red><strong>PayPal:</strong><br />
Paga cliccando su questo link a PayPal:<br />
<form action="https://www.paypal.com/cgi-bin/webscr" method="post">
<input type="hidden" name="cmd" value="_xclick">
<input type="hidden" name="business" value="paypaladdress">
<input type="hidden" name="item_name" value="###ORDER_UID###">
<input type="hidden" name="amount" value="###PRICE_TOTAL_TAX###">
<input type="hidden" name="currency_code" value="EUR">
<input type="image" 
src="http://www.paypal.com/it_IT/i/btn/x-click-but01.gif" name="submit" 
alt="Effettua i tuoi pagamenti con PayPal. È un sistema rapido, gratuito 
e sicuro.">
</form>
</font></p>
<!-- ###MESSAGE_PAYMENT_20### end -->

but the form doen't works, since the "upper" form has precedence..

please any working example?
and after paypal payment, where do i make it redirect to?

thanks
stefano cecere