// tiny scrollbar
(function($) {
    $.fn.tinyscrollbar = function(options) {
        var defaults = {axis:'y',wheel:40,scroll:true,size:'auto',sizethumb:'auto'};
        var options = $.extend(defaults, options);
        var oWrapper = $(this);
        var oViewport = {obj:$('.viewport', this)};
        var oContent = {obj:$('.overview', this)};
        var oScrollbar = {obj:$('.scrollbar', this)};
        var oTrack = {obj:$('.track', oScrollbar.obj)};
        var oThumb = {obj:$('.thumb', oScrollbar.obj)};
        var sAxis = options.axis == 'x',sDirection = sAxis ? 'left' : 'top',sSize = sAxis ? 'Width' : 'Height';
        var iScroll,iPosition = {start:0,now:0},iMouse = {};
        if (this.length > 1) {
            this.each(function() {
                $(this).tinyscrollbar(options)
            });
            return this;
        }
        this.initialize = function() {
            this.update();
            setEvents();
        };
        this.update = function() {
            iScroll = 0;
            oViewport[options.axis] = oViewport.obj[0]['offset' + sSize];
            oContent[options.axis] = oContent.obj[0]['scroll' + sSize];
            oContent.ratio = oViewport[options.axis] / oContent[options.axis];
            oScrollbar.obj.toggleClass('disable', oContent.ratio >= 1);
            oTrack[options.axis] = options.size == 'auto' ? oViewport[options.axis] : options.size;
            oThumb[options.axis] = Math.min(oTrack[options.axis], Math.max(0, (options.sizethumb == 'auto' ? (oTrack[options.axis] * oContent.ratio) : options.sizethumb)));
            oScrollbar.ratio = options.sizethumb == 'auto' ? (oContent[options.axis] / oTrack[options.axis]) : (oContent[options.axis] - oViewport[options.axis]) / (oTrack[options.axis] - oThumb[options.axis]);
            setSize();
        };
        function setSize() {
            if (!sAxis)oContent.obj.removeAttr('style');
            oThumb.obj.removeAttr('style');
            iMouse['start'] = oThumb.obj.offset()[sDirection];
            var sCssSize = sSize.toLowerCase();
            oScrollbar.obj.css(sCssSize, oTrack[options.axis]);
            oTrack.obj.css(sCssSize, oTrack[options.axis]);
            oThumb.obj.css(sCssSize, oThumb[options.axis]);
        }

        ;
        function setEvents() {
            oThumb.obj.bind('mousedown', start);
            oTrack.obj.bind('mouseup', drag);
            if (options.scroll && this.addEventListener) {
                oWrapper[0].addEventListener('DOMMouseScroll', wheel, false);
                oWrapper[0].addEventListener('mousewheel', wheel, false);
            }
            else if (options.scroll) {
                oWrapper[0].onmousewheel = wheel;
            }
        }

        ;
        function start(oEvent) {
            iMouse.start = sAxis ? oEvent.pageX : oEvent.pageY;
            var oThumbDir = parseInt(oThumb.obj.css(sDirection));
            iPosition.start = oThumbDir == 'auto' ? 0 : oThumbDir;
            $(document).bind('mousemove', drag);
            $(document).bind('mouseup', end);
            oThumb.obj.bind('mouseup', end);
            return false;
        }

        ;
        function wheel(oEvent) {
            if (!(oContent.ratio >= 1)) {
                oEvent = $.event.fix(oEvent || window.event);
                var iDelta = oEvent.wheelDelta ? oEvent.wheelDelta / 120 : -oEvent.detail / 3;
                iScroll -= iDelta * options.wheel;
                iScroll = Math.min((oContent[options.axis] - oViewport[options.axis]), Math.max(0, iScroll));
                oThumb.obj.css(sDirection, iScroll / oScrollbar.ratio);
                oContent.obj.css(sDirection, -iScroll);
                oEvent.preventDefault();
            }
            ;
        }

        ;
        function end(oEvent) {
            $(document).unbind('mousemove', drag);
            $(document).unbind('mouseup', end);
            oThumb.obj.unbind('mouseup', end);
            return false;
        }

        ;
        function drag(oEvent) {
            if (!(oContent.ratio >= 1)) {
                iPosition.now = Math.min((oTrack[options.axis] - oThumb[options.axis]), Math.max(0, (iPosition.start + ((sAxis ? oEvent.pageX : oEvent.pageY) - iMouse.start))));
                iScroll = iPosition.now * oScrollbar.ratio;
                oContent.obj.css(sDirection, -iScroll);
                oThumb.obj.css(sDirection, iPosition.now);
                ;
            }
            return false;
        }

        ;
        return this.initialize();
    };
})(jQuery);