Drupal 6 jQuery Demo

example HTML

<a href="#" id="togg-link">Click this link to toggle the content displayed below</a>
<div id="togg">Content to be toggled.</div>

scripts.js

Drupal.behaviors.togg = function (context) {
  $('a#togg-link:not(.togg-processed)', context).addClass('togg-processed').each(function () {
    $(this).click(function() {
      $("div#togg").toggle(400);
      return false;
    });
  });
};

usage

Usage
-----
- Output the HTML somewhere (e.g. in a node body)
- Add the js to your theme's scripts.js file

See: http://lhmdesign.com/drupal-jquery-demo for a demo