Design a stand alone collapsible fieldset

Ok, thought is not the best solution yet, as because for we newbies that just want to experiment with some test-page doings and not have to study for hours how independently JavaScript code(files) can be loaded within a single node
see Ajax Load or Have php snippet that needs to add a javascript onload event to the body element I will provide here my very simple example:

1. Step

- Insert any JavaScript code or a cloned .js file that you will find in your Drupal installation/folder misc/
in this example I copied the content of collapse.js file in my new page or story node-type and add some very important HTML code that initially you get mad to realize (<!-- after the beginning script-type declaration and //--> at the "end" and before the closing script-type declaration).

Here the collapse.js content

<script type="text/javascript"><!--
Drupal.toggleFieldset = function(fieldset) {
  if ($(fieldset).is('.collapsed')) {
    // Action div containers are processed separately because of a IE bug
    // that alters the default submit button behavior.
    var content = $('> div:not(.action)', fieldset);
    $(fieldset).removeClass('collapsed');
    content.hide();
    content.slideDown( {
      duration: 'fast',
      easing: 'linear',
      complete: function() {
        Drupal.collapseScrollIntoView(this.parentNode);
        this.parentNode.animating = false;
        $('div.action', fieldset).show();
      },
      step: function() {
        // Scroll the fieldset into view
        Drupal.collapseScrollIntoView(this.parentNode);
      }
    });
  }
  else {
    $('div.action', fieldset).hide();
    var content = $('> div:not(.action)', fieldset).slideUp('fast', function() {
      $(this.parentNode).addClass('collapsed');
      this.parentNode.animating = false;
    });
  }
};

/**
 * Scroll a given fieldset into view as much as possible.
 */
Drupal.collapseScrollIntoView = function (node) {
  var h = self.innerHeight || document.documentElement.clientHeight || $('body')[0].clientHeight || 0;
  var offset = self.pageYOffset || document.documentElement.scrollTop || $('body')[0].scrollTop || 0;
  var posY = $(node).offset().top;
  var fudge = 55;
  if (posY + node.offsetHeight + fudge > h + offset) {
    if (node.offsetHeight > h) {
      window.scrollTo(0, posY);
    } else {
      window.scrollTo(0, posY + node.offsetHeight - h + fudge);
    }
  }
};

Drupal.behaviors.collapse = function (context) {
  $('fieldset.collapsible > legend:not(.collapse-processed)', context).each(function() {
    var fieldset = $(this.parentNode);
    // Expand if there are errors inside
    if ($('input.error, textarea.error, select.error', fieldset).size() > 0) {
      fieldset.removeClass('collapsed');
    }

    // Turn the legend into a clickable link and wrap the contents of the fieldset
    // in a div for easier animation
    var text = this.innerHTML;
      $(this).empty().append($('<a href="#">'+ text +'</a>').click(function() {
        var fieldset = $(this).parents('fieldset:first')[0];
        // Don't animate multiple times
        if (!fieldset.animating) {
          fieldset.animating = true;
          Drupal.toggleFieldset(fieldset);
        }
        return false;
      }))
      .after($('<div class="fieldset-wrapper"></div>')
      .append(fieldset.children(':not(legend):not(.action)')))
      .addClass('collapse-processed');
  });
};
//--></script>

2. Step

add your HTML code that needs the JavaScript Functions or as in this Fieldset-Example the code above.
It should work ! see my Filedset-Test Page

Enjoy