var SlideList = new Class({
	initialize: function(menu, options) {
		this.setOptions(this.getOptions(), options);
		 
		this.menu = $(menu);
        this.current = this.menu.getElement('li.' + this.options.currentItemClass);
		this.lastHighlighted = this.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('nav_background').adopt(new Element('div').addClass('nav_background_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 {
            currentItemClass: 'current',
			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 ) {
			this.back.fx.custom({
				left: [this.back.offsetLeft, to.offsetLeft],
				width: [this.back.offsetWidth, to.offsetWidth]
			});
		} else if ( to ) {
			this.clearTimeout = $clear( this.clearTimeout );
			this.back.fx.custom({
				left: [this.back.offsetLeft, to.offsetLeft],
				width: [this.back.offsetWidth, to.offsetWidth],
				opacity: [this.back.getStyle( 'opacity' ), 1.0]
			});
		} else {
			this.back.fx.custom({
				opacity: [1.0, 0]
			});
		}
	}
});
 
SlideList.implement(new Options);