What does the javascript snippet mean?
<pre><code>if(self!=top){ window.open(self.location,'_top'); }
</code></pre>

<p>Can someone explain this?</p>

<p><strong>EDIT</strong></p>

<p>What does <code>self!=top</code> and <code>window.open(self.location,'_top')</code> mean respectively?</p>
