(function($){

    $.fn.extend({



    //pass the options variable to the function

    accordion: function(options) {

        

		var defaults = {

			accordion: 'true',

			speed: 300,

			closedSign: '[+]',

			openedSign: '[-]'

		};



		// Extend our default options with those provided.

		var opts = $.extend(defaults, options);

		//Assign current element to variable, in this case is UL element

 		var $this = $(this);

 		

 		//add a mark [+] to a multilevel menu

 		$this.find("li").each(function() {

 			if($(this).find("ul").size() != 0){

 				//add the multilevel sign next to the link

 				$(this).find("a:first").append("<span>"+ opts.closedSign +"</span>");

 				

 				//avoid jumping to the top of the page when the href is an #

 				if($(this).find("a:first").attr('href') == "#"){

 		  			$(this).find("a:first").click(function(){return false;});

 		  		}

 			}

 		});



 		//open active level

 		$this.find("li.active").each(function() {

 			$(this).parents("ul").slideDown(opts.speed);

 			$(this).parents("ul").parent("li").find("span:first").html(opts.openedSign);

 		});



  		$this.find("li a").click(function() {

  			if($(this).parent().find("ul").size() != 0){

  				if(opts.accordion){

  					//Do nothing when the list is open

  					if(!$(this).parent().find("ul").is(':visible')){

  						parents = $(this).parent().parents("ul");

  						visible = $this.find("ul:visible");

  						visible.each(function(visibleIndex){

  							var close = true;

  							parents.each(function(parentIndex){

  								if(parents[parentIndex] == visible[visibleIndex]){

  									close = false;

  									return false;

  								}

  							});

  							if(close){

  								if($(this).parent().find("ul") != visible[visibleIndex]){

  									$(visible[visibleIndex]).slideUp(opts.speed, function(){

  										$(this).parent("li").find("span:first").html(opts.closedSign);

  									});

  									

  								}

  							}

  						});

  					}

  				}

  				if($(this).parent().find("ul:first").is(":visible")){

  					$(this).parent().find("ul:first").slideUp(opts.speed, function(){

  						$(this).parent("li").find("span:first").delay(opts.speed).html(opts.closedSign);

  					});

  					

  					

  				}else{

  					$(this).parent().find("ul:first").slideDown(opts.speed, function(){

  						$(this).parent("li").find("span:first").delay(opts.speed).html(opts.openedSign);

  					});

  				}

  			}

  		});

    }

});

})(jQuery);