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  Element.register(elem, 'input.active', 'mouseover', function(e) {
    e._target.addClassName('hover');
  });
  Element.unregister(elem, 'input.active', 'mouseover');

  Element.store(elem, key, value);
  Element.retrieve(elem, key, default);

=head1 DESCRIPTION

Some extensions to the basic abstractions supplied by
prototype.js.

=head1 METHODS

=head2 Events delegation

  Will be a part of prototype's core distribution starting version 1.7
  as discussed here 
  [https://prototype.lighthouseapp.com/projects/8886/tickets/435-eventdelegate-and-elementmethodsdelegate]

=head2 Prototype.getJSON

  Prototype.getJSON(url, callback)

based on: getJSON function by Juriy Zaytsev L<http://github.com/kangax/protolicious/tree/master/get_json.js>

A method to temporarily load JSON data (ideally hosted on a different domain and accessible via JSONP service) and send it over to callback method when ready.


=head2 Hash utilities

=head3 Hash.expand

  var tree = Hash.expand(flat_hash);

Transforms a flat structure of key-value pairs into a nested tree
structure, by splitting keys on dots.
The idea and algorithm come from L<CGI::Expand/expand_hash>.

  Hash.expand({a: '...', b.0.x: '...', b.0.y: '...', b.1.x: '...', b.1.y: '...'}) =>
  {a: '...', b: [{x: '...', y: '...'}, {x: '...', y: '...'}]}

=head3 Hash.flatten

The exact opposite of Hash.expand

Transforms a nested tree structure into a flat hash of key-value pairs
where nested keys are joined by a dot.

=head2 String extensions

=head3 chomp

Strips any trailing line breaks (\r\n) from a String.

=head2 Element extensions

=head3 flash

only applied to ['SPAN', 'DIV', 'INPUT', 'BUTTON', 'TEXTAREA', 'A'] elements.

used to set a classname to the element for a brief moment of time.

  Element.flash(elem, {duration: I<time_mes>, classname: I<classname_to_set>});

=head3 hasAnyClass

  if (Element.hasAnyClass(elem, ["class1", "class2", ...]) {...}  

  if (Element.hasAnyClass(elem, "class1") {...}  

Returns true if the supplied element has any of the given classes. 
For convenience, also accepts a single string instead of an array
when testing for a single class.

=head3 getElementsByClassNames

  var subElements 
     = Element.getElementsByClassNames(rootElement, ["class1", "class2", ...]);

Returns an array of children of C<rootElement> that have any
of the given class names.

=head3 navigateDom

  var wantedClasses = ["class1", "class2", ...];
  
  // which direction to navigate (could be "parentNode", etc.)
  var direction     = "nextSibling"; 

  // some criteria for stopping navigation (can be anything, here a stupid
  // example)
  var stopCondition = function(elem) {return elem.innerHTML.length > 10}

  var nextElement
    = Element.navigateDom(startElement, direction, wantedClasses,
                          stopCondition);

Returns an extended (prototype's C<Element.extend()>) copy of HTMLElement.

Walks through the DOM in the given direction, until finding an
element that has one of the given classnames, or finding a stop
condition (in which case C<null> is returned).


=head3 autoScroll

  Element.autoScroll(elem, percentage) 

Makes sure that C<elem> is visible in the central area of 
its offset parent; if not, the parent is scrolled.
C<percentage> is the ratio between the parent height and the 
margin at which scrolling must occur, i.e. if 
C<percentage = 20> (the default), then scrolling
occurs if the element is in the higher than the top 20% or 
lower than the bottom 20% of the viewport.


=head3 outerHTML