Why do some sites use jquery with a $j instead of just a $?
<p>I generally use this in jquery</p>

<pre><code>$(document).ready(function() {
    //stuff
}
</code></pre>

<p>I was just on a site that heavily uses jquery and they call it using   </p>

<pre><code>$j(document).ready(function() {
    //stuff
}
</code></pre>

<p>On this site they start almost everything out with a j...  </p>

<pre><code>function PostComment(form) {
  form = $j(form);
  $j('#CommentSubmitButton').hide();
  $j('#CommentInProgress').show();
  $j.post('/utils/ajaxhandler.aspx', form.serialize(), function(data) {
    $j('#CommentInProgress').hide();
    $j('#CommentSubmitButton').show();
  });
}
</code></pre>

<p>Is this just another way of doing it or is this dependent on a differnt version of jquery or other?</p>
