/*
quickTree 0.4 - Simple jQuery plugin to create tree-structure navigation from an unordered list
http://scottdarby.com/

Copyright (c) 2009 Scott Darby

Dual licensed under the MIT and GPL licenses:
http://www.opensource.org/licenses/mit-license.php
http://www.gnu.org/licenses/gpl.html
*/
jQuery.fn.quickTree = function() {
return this.each(function(){

//set variables
var $tree = $(this);
var $roots = $tree.find('li');

//set last list-item as variable (to allow different background graphic to be applied)
$tree.find('li:last-child').addClass('last');

//add class to allow styling
$tree.addClass('tree');

//hide all lists inside of main list by default
$tree.find('ul').hide();

//iterate through all list items
$roots.each(function(){

//if list-item contains a child list
if ($(this).children('ul').length > 0) {
//add expand/contract control
$(this).addClass('root').prepend('<span class="expand" />');
}
}); //end .each

//handle clicking on expand/contract control
$('span.expand').toggle(
//if it's clicked once, find all child lists and expand
function(){
$(this).toggleClass('contract').nextAll('ul').slideDown();
},
//if it's clicked again, find all child lists and contract
function(){
$(this).toggleClass('contract').nextAll('ul').slideUp();
}
);
});
};