Try this button for payment:
<form action="https://www.paypal.com/cgi-bin/webscr" method="post">
<input type="hidden" name="cmd" value="_xclick">
<input type="hidden" name="business" value="
[email protected]">
<input type="hidden" name="undefined_quantity" value="1">
<input type="hidden" name="item_name" value="SCR9 "Unofficial" Official Photo CD">
<input type="hidden" name="amount" value="20.00">
<input type="hidden" name="no_shipping" value="2">
<input type="hidden" name="no_note" value="1">
<input type="hidden" name="currency_code" value="USD">
<input type="hidden" name="lc" value="US">
<input type="hidden" name="bn" value="PP-BuyNowBF">
<input type="image" src="https://www.paypal.com/en_US/i/btn/x-click-but6.gif" border="0" name="submit" alt="Make payments with PayPal - it's fast, free and secure!">
</form>