Secure Paypal Donate Button with Custom Amount Field

paypal_donate.html

<form action="https://www.paypal.com/cgi-bin/webscr" method="post">                
  <input type="hidden" name="business" 	value="[Your Secure Merchant ID]" >
  <input type="hidden" name="cmd" 	value="_donations" >
  <input type="hidden" name="item_name" value="[Donation Description]" >
  <input type="hidden" name="return" 	value="http://yourdomain.com/thank-you" >
  <div>
      <label for="amount">Donation Amount:</label>	
      <input name="amount" type="text" id="amount" >
  </div> 
  <input name="submit" type="submit" value="Donate" >
</form>