<form action="https://www.paypal.com/cgi-bin/webscr" method="post" target="_top">
     <input type="hidden" name="cmd" value="_s-xclick" />
     <input type="hidden" name="hosted_button_id" value="HXJ9BDH45MVSL" />
   <form action="https://www.paypal.com/cgi-bin/webscr" method="post" target="_top">
     <input type="hidden" name="cmd" value="_s-xclick" />
     <input type="hidden" name="hosted_button_id" value="HXJ9BDH45MVSL" />