var avScroll = new Class({

    options: {
        imgWidth: 0,
        scrollRange: 0,
        leftHandle: null,
        rightHandle: null,
        container: null,
        leftClicks: 0,
        rightClicks: 0,
        speed: 500
    },

    initialize: function(options) {
        this.setOptions(options)

        this.imgWidth = options['imgWidth'];
        this.scrollRange = options['scrollRange'];
        this.leftHandle = options['leftHandle'];
        this.rightHandle = options['rightHandle'];
        this.container = $(options['container']);

        if ($(options['ff'])) {
            this.ff = $(options['ff']);
            $(this.ff).addEvent('click', this.fastForward.bindWithEvent(this));
        }
        if ($(options['rw'])) {
            this.rw = $(options['rw']);
            $(this.rw).addEvent('click', this.speedReverse.bindWithEvent(this));
        }

        this.leftClicks = 0;
        this.rightClicks = 0;
        this.speed = options['speed'];

        $(this.leftHandle).addEvent('click', this.leftClick.bindWithEvent(this));
        $(this.rightHandle).addEvent('click', this.rightClick.bindWithEvent(this));

    },
    leftClick: function() {

        if (this.leftClicks > 0) {
            var start = this.leftClicks * this.imgWidth;
            var end = (this.leftClicks - 1) * this.imgWidth;
            $(this.container).effect('right', { duration: this.speed, wait: true, transition: Fx.Transitions.Back.easeIn }).start(start, end);
            this.leftClicks--;
        }


    },

    rightClick: function() {
        
        var start = this.leftClicks * this.imgWidth;
        var end = (this.leftClicks * this.imgWidth) + this.imgWidth;
        $(this.container).effect('right', { duration: this.speed, wait: true, transition: Fx.Transitions.Back.easeIn }).start(start, end);
        this.leftClicks++;

    },

    fastForward: function() {
        // scroll 4 images to the right, calculate it on base of the clicks and the image width
        var start = (this.leftClicks) * this.imgWidth;
        var end = ((this.leftClicks + 4) * this.imgWidth);
        $(this.container).effect('right', { duration: this.speed, wait: true, transition: Fx.Transitions.Back.easeIn }).start(start, end);
        this.leftClicks = this.leftClicks + 4;


    },

    speedReverse: function() {
        var start = (this.leftClicks * this.imgWidth);
        var end = ((this.leftClicks - 4) * this.imgWidth);
        $(this.container).effect('right', { duration: this.speed, wait: true, transition: Fx.Transitions.Back.easeIn }).start(start, end);
        this.leftClicks -= 4;

    }

});
avScroll.implement(new Options, new Events);