$(function(){
	(function($){
		
		$.fn.accordion = function(custom) {
			var defaults = {
				keepOpen: false,
				startingOpen: false
			} 
			var settings = $.extend({}, defaults, custom);
			if(settings.startingOpen){
				$(settings.startingOpen).show();
			}
		
			return this.each(function(){
				var obj = $(this);
				$('li a', obj).click(function(event){
						var elem = $(this).next();
						if(elem.is('ul')){
							event.preventDefault();
							if(!settings.keepOpen){
								obj.find('ul:visible').not(elem).not(elem.parents('ul:visible')).slideUp();
							}
							elem.slideToggle();
						}
				});
			});
		};
	})(jQuery);
	
	$('#menuarbol').accordion({keepOpen:false, startingOpen: '#open'});
});