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);