Finding if a jquery plugin/function is available. Diff between $.pluginName() and $().pluginName()
<p>I am trying to detect if a jQuery plugin is available, I tried </p>

<pre><code>$.pluginName
</code></pre>

<p>but failed then tried</p>

<pre><code>$().pluginName
</code></pre>

<p>it works. But whats the difference between the 2?</p>
