var SlideList = new Class({
	initialize: function(menu, options) {
		this.setOptions(this.getOptions(), options);

		this.menu = $(menu), this.current = this.menu.getElement('.selected');
        
		this.menu.getElements('li').each(function(item){
			if (item.getElements('a')[0]) {
                item.getElements('a')[0].addEvent('mouseover', function(){ this.moveBg(item); }.bind(this));
			    item.getElements('a')[0].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);

        this.fakeCurrent = new Element('li').setStyles({left: (this.menu.getElements('li')[0].offsetLeft)+'px', top: (this.menu.getElements('li')[0].offsetTop)+'px', width:'0px', position: 'absolute', visibility: 'hidden'}).injectInside(this.menu);
        var newwidth = (this.menu.getElements('li')[0].getElements('a')[0])?this.menu.getElements('li')[0].getElements('a')[0].offsetWidth : this.menu.getElements('li')[0].offsetWidth;
        this.back.setStyles({left: (this.menu.getElements('li')[0].offsetLeft)+'px', width: (newwidth)+'px', top: (this.menu.getElements('li')[0].offsetTop)+'px'});

        if(this.current) {
            if(this.options.animateEntry) {
                this.setCurrent(this.fakeCurrent, null, true);
                this.moveBg(this.current);
            }
            this.setCurrent(this.current);
        } else {
//            this.fakeCurrent = new Element('li').setStyles({left: (this.menu.getElements('li')[0].offsetLeft)+'px', top: (this.menu.getElements('li')[0].offsetTop)+'px', width:'0px', position: 'absolute', visibility: 'hidden'}).injectInside(this.menu);
//            this.back.setStyles({left: (this.menu.getElements('li')[0].offsetLeft)+'px', width: (this.menu.getElements('li')[0].offsetWidth)+'px', top: (this.menu.getElements('li')[0].offsetTop)+'px'});
            this.current = this.fakeCurrent;
            this.setCurrent(this.current)
        }
	},
	
	setCurrent: function(el, effect, nocurrent){
        var newwidth = (el.getElements('a')[0])?el.getElements('a')[0].offsetWidth : el.offsetWidth;
        this.back.setStyles({left: (el.offsetLeft)+'px', width: (newwidth)+'px', top: (el.offsetTop)+'px'});
		(effect) ? this.back.effect('opacity').set(0).start(1) : this.back.setOpacity(1);
		if (!nocurrent) 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;
        var newwidth = (to.getElements('a')[0])?to.getElements('a')[0].offsetWidth : to.offsetWidth;
   		this.back.fx.custom({
			    left: [this.back.offsetLeft, to.offsetLeft],
                top: [this.back.offsetTop, to.offsetTop],
			    width: [this.back.offsetWidth, newwidth]
		    });
    }
});

SlideList.implement(new Options);