Uncaught TypeError: Cannot set property 'className' of null
<p>I am using js file for paginate a table. It occurs an error while I am trying to click on next page button. It just show the error like this "Uncaught TypeError: Cannot set property 'className' of null". </p>

<p>Here is my code:</p>

<pre><code>    var oldPageAnchor = document.getElementById('pg'+this.currentPage);
    oldPageAnchor.className = 'pg-normal';
    this.currentPage = pageNumber;
    var newPageAnchor = document.getElementById('pg'+this.currentPage);
    newPageAnchor.className = 'pg-selected'; 
</code></pre>
