Creating A Donation Button

Howdy. So i’m not that good at html, java, etc. I know some, but not the greatest. A friend of mine has a webpage he is building and came to me with a question I couldn’t answer and I thought I would ask for him here.
He has had some e-mails from people who visited his site offering to donate to him and he wanted to create a button to allow them to donate what they wished to his pay pal account. I wasn’t sure how to do this, and so I tried to research it to help him and to learn a bit more myself. I have been unable to find anything. Most things that come up through google or yahoo are actual links to donate to sites. Nothing on showing how to make a button to do this. So I tried viewing and understanding the code a bit in the html source of many websites, but have only understood little. Guess it’s not my best field.
However, I do realize at this point it would require a form and form action which I learned through this part of the code everyone has.

<form action="" method="post">
              <input type="hidden" name="cmd" value="_s-xclick"><p align="center">
                          <input type="image" src="" border="0" name="submit" alt="Make payments with PayPal - it's fast, free and secure!" width="110" height="23">
                          <img alt border="0" src="" width="1" height="1">

Anyways, anyone have some info on how he can do this? I’m gonna look around some more atm.