Highlighting search results do not work in some situation
<p>I am very new in Javascript.</p>

<p>I want to make some basic stuffs that can be used in my future project.</p>

<p>One of the stuffs I need is highlighting some keywords.</p>

<p><a href="http://jsfiddle.net/4wMjP/1/" rel="nofollow">http://jsfiddle.net/4wMjP/1/</a></p>

<p>You can find the working code for the functionality at the above link.</p>

<p>The problem is if I uncomment the following line in HTML,</p>

<pre><code>&lt;!-- &lt;h1&gt;Polls show Romney surging ahead of Gingrich in Florida&lt;/h1&gt; --&gt;
</code></pre>

<p>The functionality does not work.</p>

<p>What is the problem and how to solve the problem?</p>
