var SlideList = new Class({
	initialize: function(menu, options) {
		this.setOptions(this.getOptions(), options);
		
		this.menu = $(menu), this.current = this.menu.getElement('li.current');
		
		this.menu.getElements('li').each(function(item){
		item.addEvent('mouseover', function(){ this.moveBg(item); }.bind(this));
		item.addEvent('mouseout', function(){ this.moveBg(this.current); }.bind(this));
		item.addEvent('click', function(event){ this.clickItem(event, item); }.bind(this));
	}.bind(this));
	

	this.back = new Element('li').addClass('background').adopt(new Element('div').addClass('left')).injectInside(this.menu);
	this.back.fx = this.back.effects(this.options);
	if(this.current) this.setCurrent(this.current);
	},
	
	setCurrent: function(el, effect){

	this.back.setStyles({left: (el.offsetLeft)+'px', width: (el.offsetWidth)+'px'});
	(effect) ? this.back.effect('opacity').set(0).start(1) : this.back.setOpacity(1);
	this.current = el;
	},
	
	getOptions: function(){

	return {
	transition: Fx.Transitions.sineInOut,
	duration: 500, wait: false,
	onClick: Class.empty
	};
	},

	
	clickItem: function(event, item) {
	if(!this.current) this.setCurrent(item, true);
	this.current = item;
	this.options.onClick(new Event(event), item);
	},

	
	moveBg: function(to) {
	if(!this.current) return;
	this.back.fx.custom({
	left: [this.back.offsetLeft, to.offsetLeft],
	width: [this.back.offsetWidth, to.offsetWidth]

	});
	}
	});
	
	SlideList.implement(new Options);