Say if you have a form/button like this:
<form method="post" action="https://www.paypal.com/cgi-bin/webscr">
<input type="hidden" value="_s-xclick" name="cmd" /> <input type="hidden" value="THEBUTTONID" name="hosted_button_id" />
<input width="75%" height="75%" type="image" border="0" alt="PayPal - The safer, easier way to pay
online!" name="submit" src="/images/buynow.gif" />
</form>
To use it as a plain HTML link just use:
https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=THEBUTTONID
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