jQuery.trim does not work when i try to filter a table
<p>I have a textbox to put text in order to filter an html table. I want to trim the textbox contents before filter the table:</p>

<p><strong>Demo</strong>: <a href="http://jsfiddle.net/QFQ5k/94/" rel="nofollow">http://jsfiddle.net/QFQ5k/94/</a></p>

<p>The line that makes the filtering is:</p>

<pre><code>return $(this).find("[zip^='"+ $.trim($("#txtbox").val())+"']").length&gt;0;
</code></pre>

<p>EDIT: It works succesfully, i tested it wrongly, but I <strong>want that alone blank space shows all table rows.</strong></p>
