Callback function - use of parentheses
<p>I'm new to jQuery and am bit confused about the use (or not) of parentheses with a callback function. Say I have a function:</p>

<pre><code>function cb() {
 // do something
}
</code></pre>

<p>Now what is the difference between:</p>

<pre><code>$("p").hide(1000, cb);
</code></pre>

<p>and</p>

<pre><code>$("p").hide(1000, cb());
</code></pre>

<p>Is it to do with <em>when</em> the cb function is executed? It would be great if someone could explain this to me in the simplest of terms.</p>
