To add this to your weblinks page just highlight and copy the text below, then in your page's editor click on the <> icon ( in version 2.62 ) or the HTML icon in version 2.71 and paste into the window that pops up. Change the highlighted red text to your own domain and image names.
<div style="width: 400px; margin: 0 auto; text-align:center"><h2>Grab my Banner!</h2>
<img src="http://yourdomain.com/images/yourbanner.gif" border="0" height="125" width="125"><br>
<textarea name="textarea" cols="65" rows="5"><a href="http://yourdomain.com" target="_blank"><img border="0" src="http://yourdomain.com/images/yourimage.gif" width="125" height="125"></a></textarea>
</div>