Thanks for linking Kirkpatrick.nu! Your support is appreciated.
Please upload the images to your site and link them back.
<a href="http://kirkpatrick.nu/" target=_blank>
<img src="image.gif/.jpg" alt="Kirkpatrick.nu"></a>
You would replace image.gif/.jpg with the location of the button on your site.
(Note: You can directly link to these images if you must but it is prefered that you upload them to your own server.)