JQuery :: Replace .click With An Auto Function?

I have some jQuery which I used on a site a couple of years ago. It basically loads some content into a DIV, which can be rotated using a .click function.I'd like to use the same code again, and I have got it working, but instead of having to click a link with a specific ID, I'd like it to automatically run every 4 seconds.

Here is my code:

var $j = jQuery.noConflict();
$j(function(){
var offset = 5;

[code]....

and here is my HTML to trigger the function:

<div id="postContainer">... loading ...</div>
<a href="#" id="another">show another</a></span>

replace that .click function to run automatically every 4 seconds.