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" />');
				
            }
			else
			{
				$(this).addClass('noroot');	
			}
            
        }); //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();
            }
        );
    });
};