Here you go, give this one a try. You will need to put in your PayPal account email address in the business variable value, marked "<TODO>" below.
<form action="https://www.paypal.com/cgi-bin/webscr" method="post">
<input type="hidden" name="cmd" value="_xclick-subscriptions">
<input type="hidden" name="business" value="<TODO>">
<input type="hidden" name="lc" value="US">
<input type="hidden" name="item_name" value="Donate to My Organization">
<input type="hidden" name="item_number" value="1234">
<input type="hidden" name="no_note" value="1">
<input type="hidden" name="no_shipping" value="2">
<input type="hidden" name="src" value="1">
<input type="hidden" name="p3" value="1">
<input type="hidden" name="currency_code" value="USD">
<input type="hidden" name="t3" value="M">
<input type="hidden" name="srt" value="0">
<table>
<tr><td>Enter Your Donation Amount?</td></tr><tr><td><select name="a3">
<option value="10.00">$10</option>
<option value="25.00">$25</option>
<option value="50.00">$50</option>
<option value="100.00">$100</option>
<option value="200.00">$200</option>
</select> </td></tr>
</table>
<input type="image" src="https://www.paypal.com/en_US/i/btn/btn_donateCC_LG.gif" border="0"
name="submit" alt="PayPal - The safer, easier way to
pay online!">
<img alt="" border="0" src="https://www.paypal.com/en_US/i/scr/pixel.gif" width="1" height="1">
</form>
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