This trick is coming from my friend Nix.
If you are developing a site containing Google Adsense you might know that clicking on your own ad is not allowed.
To be able to test and click on your own ad and still follow Google AdSense Program Policies, just add following to your pages:
<script type="text/javascript">google_adtest='on';</script>
<form id="aspnetForm" name="aspnetForm" action="http://blogs.codes-sources.com/nix/archive/2007/10/03/adsense-comment-viter-de-faire-un-clicks-incorrects-sur-vos-propres-annonces.aspx" method="post">
<div id="page">
<div id="wrapper">
<div id="main">
<div class="narrowcolumn" id="content">
<div class="post">
<div class="post-content">Don't forget to remove it on your production environment! ;)</div>
</div>
</div>
</div>
</div>
</div>
</form>