How to load Jquery.js if not already loaded ?
<p>I need to check if I need to load JQuery OR it is already loaded by another page !? </p>

<p>How can I check this on client side ?
I want to have something like this:</p>

<pre><code>&lt;script &gt;
 if jquery-1.6.2.js isExist then
   {return}
 else // somehow 
   load (&lt;script src="../js/jq/jquery-1.6.2.js"&gt;&lt;/script&gt; )
&lt;/script&gt;
</code></pre>
