Paypal Integration in sharepoint

hi,
 
There is a webpart which has few fields submitting to database.
in this webpart need to add a button for to integrate the paypal.here is the code which paypal has provided
to integrate to any application.
<form target="paypal" action="https://www.paypal.com/cgi-bin/webscr" method="post">
<input type="hidden" name="cmd" value="_s-xclick">
<input type="hidden" name="hosted_button_id" value="1902376">
<input type="image" src="https://www.paypal.com/en_US/i/btn/btn_donate_LG.gif" border="0" name="submit" alt="">
<img alt="" border="0" src="https://www.paypal.com/en_US/i/scr/pixel.gif" width="1" height="1">
</form>

 

The problem is it has a form tag embedded with this.
There is already a form  in the sharepoint page itself which has action submitted to the same page.
i need a solution like... i can integreate this paypal code in the webpart.
without the page being post backed or refreshed.

how can mutiple forms achieved in sharepoint.. or any other way to do this paypal integration.

Thanks,
Hari