$.fn.imgscroll = function(o){

    var defaults = {

        speed: 40,

        amount: 0,

        width: 1,

        dir: "left"

    };

    o = $.extend(defaults, o);

    return this.each(function(){

        var _li = $("li", this);

        _li.parent().parent().css({overflow: "hidden", position: "relative"}); //div

        _li.parent().css({overflow: "hidden", position: "relative", "list-style": "none"}); //ul

        _li.css({position: "relative", overflow: "hidden"}); //li

        if(o.dir == "left") _li.css({float: "left"});

        //初始大小

        var _li_size = 0;

        for(var i=0; i<_li.size(); i++)

            _li_size += o.dir == "left" ? _li.eq(i).outerWidth(true) : _li.eq(i).outerHeight(true);

        //循环所需要的元素

        if(o.dir == "left") _li.parent().css({width: (_li_size*3)+"px"});

        _li.parent().empty().append(_li.clone()).append(_li.clone()).append(_li.clone());

        _li = $("li", this);

        //滚动

        var _li_scroll = 0;

        function goto(){

            _li_scroll += o.width;

            if(_li_scroll > _li_size)

            {

                _li_scroll = 0;

                _li.parent().css(o.dir == "left" ? { left : -_li_scroll } : { top : -_li_scroll });

                _li_scroll += o.width;

            }

            _li.parent().animate(o.dir == "left" ? { left : -_li_scroll } : { top : -_li_scroll }, o.amount);

        }

        //开始

        var move = setInterval(function(){ goto(); }, o.speed);

        _li.parent().hover(function(){

            clearInterval(move);

        },function(){

            clearInterval(move);

            move = setInterval(function(){ goto(); }, o.speed);

        });

    });

};