Drupal 7 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

(function ($) {

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

})(jQuery);

usage

Usage
-----
- Output the HTML somewhere (e.g. in a node body)
- Add the js to your theme's scripts.js file.
  Note: ensure there is only one '(function ($) {' '})(jQuery);' in the file.
  If this already exists do not repeat it.

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