highlight a span by specific time(with Jquery):
<p>I want to highlight a span by specific time with jquery.</p>

<p>for example:(highlight this line in 20 sec)</p>

<pre><code>&lt;span&gt; highlight me slowly by specific time&lt;/span&gt;

window.setTimeout(function() {
    // what do i must write here?
}, 20*1000);
</code></pre>

<p>I want this Result:</p>

<p><a href="http://8pic.ir/images/sk9q76r96e3dc1rq4zo.swf" rel="nofollow">http://8pic.ir/images/sk9q76r96e3dc1rq4zo.swf</a></p>
