why .on can't be used in my $(document).ready() function?
<p>The page can be viewed at</p>

<p><a href="http://cistrome.org/cps/seqconfig?did=2693" rel="nofollow">http://cistrome.org/cps/seqconfig?did=2693</a></p>

<p>When load in Firebugs, it gives me this error:</p>

<pre><code>TypeError: $(".open_gene").on is not a function
[Break On This Error]   

$(".open_gene").on('change', function(event) {
</code></pre>

<p>However, if I type in this expression in Firebug's console, it can be evaluated as a function without any problems:</p>

<pre><code>&gt;&gt;&gt; $(".open_gene").on
function()
</code></pre>

<p>I was wondering what might be the reason to cause this issue.
Does anyone have ideas about this? Thanks!</p>
