jquery delay

I have the following code in the theme header and it works fine. It should change the text in some anchor tag with another one.
Problem is that it does its job only with a delay of some hundreds of milliseconds after the page is loaded.
Is there a workaround for that in order to shorten the delay until a human eye won’t recognize that?
Regards
Triplebit

<script type=”text/javascript”>
//<![CDATA[
var $j = jQuery.noConflict();
$j(document).ready(function(){
$j(“a.black:contains(‘old text’)”).text(“new text”);

});
//]]></script>