$.fn.accordion = function(settings){
		
		var menuAperto=1;
		var menuAttivo=1
		
		var idMenuAperto=menuAperto-1;
		var idMenuAttivo=menuAttivo-1
		
		var transitionTime=	(settings.transitionTime != undefined) ? settings.transitionTime : 1000; 
		var idAccordion=this;
		var divAccordion='#'+idAccordion[0].id
		var subMenu=$('ul' + divAccordion + ' ul');
		
		
		subMenu.hide();
		subMenu.eq(idMenuAperto).show();
		$('ul' + divAccordion + '>li>a').eq(idMenuAttivo).addClass('active');
		
		$('ul' + divAccordion + '>li>a').click(function(){
				subMenu.removeClass('open');
				$(this).next('ul').slideToggle(transitionTime).addClass('open');
				subMenu.not('.open').slideUp(transitionTime).parent().find('a');	
			});
		};