jquery.easing['jswing'] = jquery.easing['swing'];
jquery.extend( jquery.easing,
{
    def: 'easeoutquad',
    swing: function (x, t, b, c, d) {
        return jquery.easing[jquery.easing.def](x, t, b, c, d);
    },
    easeoutcirc: function (x, t, b, c, d) {
        return c * math.sqrt(1 - (t=t/d-1)*t) + b;
    },
    easeoutquad: function (x, t, b, c, d) {
        return -c *(t/=d)*(t-2) + b;
    },
    easeoutbounce: function (x, t, b, c, d) {
        if ((t/=d) < (1/2.75)) {
            return c*(7.5625*t*t) + b;
        } else if (t < (2/2.75)) {
            return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b;
        } else if (t < (2.5/2.75)) {
            return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b;
        } else {
            return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b;
        }
    }
});
;(function($) {
    $.fn.extend({
        "imgchange": function(o) {
            o = $.extend({   //例： $('#bigimg li').imgchange({thumbobj:'#tlist li',effect:'scroll',speed:600})
                thumbobj: null,//缩略图对象，默认为空;例:thumbobj:'.tlist li'
                botprev: null,//上一个对象;例:botprev:'.prev'
                botnext: null,//下一个对象;例:botnext:'.next'
                effect: 'fade',//切换效果,效果有fade(渐显),scroll(滚动),wfscroll(无缝滚动),slide(滑落),cutin(切入),alternately(交替),wb(微博),accordion(手风琴)默认为:'fade'
                curclass: 'act',//当前缩略图对象的样式,默认为:'act'
                thumboverevent: true,//鼠标是否悬停切换,默认为:悬停切换
                speed: 400,//切换速度,默认为:400秒
                autochange: true,//是否自动切换,默认为:自动切换
                clickfalse: false,//缩略图对象的链接是否有效,默认为:有效
                changetime: 5000,//自动切换时间,默认为5000ms切换一次
                delaytime: 0,//鼠标悬停或点击后的延迟时间
                showtxt: false,//是否显示标题,标题调用img里的alt值
                visible:1,//显示几个对象,effect==scoll且circular==true时有效 
                start: 0,//从第几个对象开始 ,effect==scoll且circular==true时有效 
                steps:1, //每次滚动的数量,effect==scoll且circular==true时有效 
                circular: false,//是否循环滚动
                vertical:true,//滚动方向,也可以是切换方向
                fqwidth: 30,//手风琴小图的尺寸，effect==accordion时有效
                easing: 'swing'//动画效果,需要easing插件支持,effect==scoll时有效 
            },
            o || {});    
            var _self = $(this);
            var _p = _self.parent();
            var _pp=_p.parent();
            var thumbobj;
            var size = _self.size();
            var nowindex = 0;
            var index;
            var startrun;
            var delayrun;
            var _img = _self.find('img');
            var b = false,
            animcss = o.vertical ? "top": "left",   
            sizecss = o.vertical ? "height": "width";
            var i;
            var g = o.vertical ? _self.outerheight(true) : _self.outerwidth(true)
            //初始化
            if (o.showtxt) {
                _p.after('<i class=\'bg\'></i><a class=\'txt\' href=\'' + _img.eq(0).parent().attr('href') + '\'>' + _img.eq(0).attr('alt') + '</a>')
            }
            if (o.effect == 'scroll'||o.effect == 'wfscroll') {             
            //滚动初始化
                var v = o.visible;
                if ( size <= v ) return false; //对象小于可见数时中止
                if (o.circular) {
                    if(o.effect == 'scroll'){
                        _p.prepend(_self.slice(size - v - 1 + 1).clone()).append(_self.slice(0, v).clone());
                        o.start += v
                    }else{      
                        _p.prepend(_self.clone())
                    }
                }
                //var f = $('li', _p),
                var f = _p.children(),
                itemlength = f.size(),
                curr = o.start,
                h = g * itemlength,
                j = g * v,
                scrollsize = g*size;
                //alert(itemlength);
                f.css({
                    overflow: 'hidden',
                    float: o.vertical ? 'none': 'left',
                    width: _self.width(),
                    height: _self.height()
                });
                _p.css({
                    margin: 0,
                    padding: 0,
                    position: 'relative',
                    liststyle: 'none',
                    overflow:'hidden',
                    zoom:1,
                    zindex: 1
                }).css(sizecss, h + 'px').css(animcss, -(curr * g));;
                _pp.css({
                    visibility: 'visible',
                    overflow: 'hidden',
                    position: 'relative',
                    zindex: 2,
                    left: 0
                }).css(sizecss, j + 'px');
            } else if (o.effect == 'accordion') {
            //手风琴初始化
                _p.css(!o.vertical ? {
                    width: g + (size - 1) * o.fqwidth + 'px',
                    overflow: 'hidden'
                }: {
                    height: g + (size - 1) * o.fqwidth + 'px',
                    overflow: 'hidden'
                }); 
                _self.css(!o.vertical ? {
                    width: o.fqwidth + 'px',
                    float: 'left',
                    overflow: 'hidden'
                }: {
                    height: o.fqwidth + 'px',
                    float: 'none',
                    overflow: 'hidden'
                }).eq(0).addclass('act').animate(!o.vertical ? {
                    width: g + 'px'
                }: {
                    height: g + 'px'
                },
                800, o.easing).end().click(function() {
                    index = _self.index($(this));
                    fadeab();
                    if (o.clickfalse) {
                        return false
                    }
                });
                if (o.thumboverevent) {
                    _self.hover(function() {
                        index = _self.index($(this));
                        delayrun = settimeout(fadeab, o.delaytime)
                    },
                    function() {
                        cleartimeout(delayrun)
                    })
                }
            } else if (o.effect == 'wb') {
            //微博效果初始化
                _p.css({
                    position: 'relative'
                });
                _pp.css({
                    height: g * o.visible,
                    overflow: 'hidden',
                    position:'relative'
                })
            } else {
                _self.hide().eq(0).show()
            };
            //悬停或点击切换
            if (o.thumbobj && !o.circular) {
                thumbobj = $(o.thumbobj);
                thumbobj.removeclass(o.curclass).eq(0).addclass(o.curclass);
                thumbobj.click(function() {
                    index = thumbobj.index($(this));
                    fadeab();
                    if (o.clickfalse) {
                        return false
                    }
                });
                if (o.thumboverevent) {
                    thumbobj.hover(function() {
                        index = thumbobj.index($(this));
                        delayrun = settimeout(fadeab, o.delaytime)
                    },
                    function() {
                        cleartimeout(delayrun)
                    })
                }
            }
            //上一个下一个
            if (o.botnext) {
                $(o.botnext).click(function() {
                    if (_self.queue().length < 1) {
                        runnext()
                    }
                    return false
                })
            }
            if(o.thumbobj&&o.circular) $.each($(o.thumbobj),
            function(i, a) {
                $(a).mouseover(function() {
                    $(o.thumbobj).removeclass(o.curclass).eq(i).addclass(o.curclass);
                    return go(o.visible + i);
                })
            });
            if (o.botprev) {
                $(o.botprev).click(function() {
                    if (o.effect == 'scroll' && o.circular) {
                    return go(curr - o.steps)
                    } else {
                        if (_self.queue().length < 1) {
                            index = (nowindex + size - 1) % size;
                            fadeab()
                        }
                        return false
                    }
                })
            }
            //自动切换
            if(o.effect=='wfscroll'){
                startrun = setinterval(marquee, o.changetime);
                _pp.hover(function() { clearinterval(startrun); }, function() { startrun = setinterval(marquee, o.changetime); });
            }else if (o.autochange) {
                startrun = setinterval(runnext, o.changetime);
                _p.add(thumbobj).add(o.botprev).add(o.botnext).hover(function() {
                    clearinterval(startrun)
                },
                function() {
                    startrun = setinterval(runnext, o.changetime)
                })
            }
            //主函数 
            function fadeab() {
                if (nowindex != index) {
                    if (o.thumbobj) {
                        $(o.thumbobj).removeclass(o.curclass).eq(index).addclass(o.curclass)
                    }
                    if (size <= index) {
                        nowindex = index;
                        return false
                    }
                    if (o.speed <= 0) {
                    //正常切换
                        _self.eq(nowindex).hide().end().eq(index).show()
                    } else if (o.effect == 'fade') {
                    //淡入淡出
                        _self.stop(true, true).eq(nowindex).fadeout(o.speed).end().eq(index).fadein(o.speed)
                    } else if (o.effect == 'scroll') {
                    //滚动
                        _p.stop(true, true).animate(!o.vertical ? {
                            left: -((index) * g)
                        }: {
                            top: -((index) * g)
                        },
                        o.speed, o.easing)
                    } else if (o.effect == 'cutin') {
                    //切入
                        _self.css({zindex: 1,display:'block'}).stop(true, true).eq(nowindex).css({
                            zindex: 5,
                            opacity: 2 
                        }).end().eq(index).css({
                            zindex: 6,
                            top: '-' + g + 'px'
                        }).animate({
                            opacity: 1,
                            top: 0
                        },
                        o.speed, o.easing)
                    } else if (o.effect == 'alternately') {
                    //交替
                        _self.css({
                            display: 'none'
                        }).stop(true, true).eq(nowindex).css({
                            zindex: 10,
                            display: 'block'
                        }).animate(!o.vertical ? {
                            left: '-' + g / 2 + 'px'
                        }: {
                            top: '-' + g / 2 + 'px'
                        },
                        o.speed,
                        function() {
                            $(this).css({
                                zindex: 5
                            }).animate(!o.vertical ? {
                                left: 0
                            }: {
                                top: 0
                            },
                            o.speed)
                        }).end().eq(index).css({
                            display: 'block'
                        }).animate(!o.vertical ? {
                            left: g / 2 + 'px'
                        }: {
                            top: g / 2 + 'px'
                        },
                        o.speed,
                        function() {
                            $(this).css({
                                zindex : 10
                            }).animate(!o.vertical ? {
                                left: 0
                            }: {
                                top: 0
                            },
                            o.speed)
                        })
                    } else if (o.effect == 'accordion') {
                    //手风琴
                        _self.stop(true, true).eq(nowindex).removeclass('act').animate(!o.vertical ? {
                            width: o.fqwidth + 'px'
                        }: {
                            height: o.fqwidth + 'px'
                        },
                        o.speed, o.easing).end().eq(index).addclass('act').animate(!o.vertical ? {
                            width: g + 'px'
                        }: {
                            height: g + 'px'
                        },
                        o.speed, o.easing)
                    } else if (o.effect == 'wb') {
                    //微博
                        _p.stop(true, true).animate({
                            top: (g + g / 4) + 'px'
                        },
                        o.speed,
                        function() {
                            _p.children().last().prependto(_p);
                            _p.children().first().hide();
                            _p.css({
                                top: 0
                            }).children().first().fadein(800)
                        })
                    } else {
                    //slide
                        _self.stop(true, true).eq(nowindex).css({zindex:10}).slideup(o.speed).end().eq(index).css({zindex:5}).slidedown(o.speed)
                    }
                    //切换标题
                    if (o.showtxt) {
                        var _txt = _img.eq(index).attr('alt');
                        var _url = _img.eq(index).parent().attr('href');
                        _p.siblings('.txt').html(_txt).attr('href', _url)
                    }
                    nowindex = index
                }
            }
            //无缝滚动函数
            function marquee() {
                if (o.vertical) {
                    if (_pp.scrolltop() >= scrollsize) {
                        _pp.scrolltop(_pp.scrolltop() - scrollsize + o.steps);
                    }
                    else {
                        i = _pp.scrolltop();
                        i += o.steps;
                        _pp.scrolltop(i)
                    }
                } else {
                    if (_pp.scrollleft() >= scrollsize) {
                        _pp.scrollleft(_pp.scrollleft() - scrollsize + o.steps);
                    }
                    else {
                        i = _pp.scrollleft();
                        i += o.steps;
                        _pp.scrollleft(i);
                    }
                }
            };
            //滚动函数
            function go(a) {
                if (size <= o.steps) return false;
                if (!b) {
                    if (o.beforestart) o.beforestart.call(this, vis());
                    if (o.circular) {
                        if (a <= o.start - v - 1) {
                            _p.css(animcss, -((itemlength - (v * 2)) * g) + 'px');
                            curr = a == o.start - v - 1 ? itemlength - (v * 2) - 1 : itemlength - (v * 2) - o.steps
                        } else if (a >= itemlength - v + 1) {
                            _p.css(animcss, -((v) * g) + 'px');
                            curr = a == itemlength - v + 1 ? v + 1 : v + o.steps
                        } else curr = a
                    } else {
                        if (a < 0 || a > itemlength - v) return;
                        else curr = a
                    }
                    b = true;
                    _p.animate(animcss == 'left' ? {
                        left: -(curr * g)
                    }: {
                        top: -(curr * g)
                    },
                    o.speed, o.easing,
                    function() {
                        if (o.afterend) o.afterend.call(this, vis());
                        b = false
                    })
                }
                return false
            }
            
            function vis() {
                return f.slice(curr).slice(0, v)
            };
            //下一个函数
            function runnext() {
                index = (nowindex + 1) % size;
                if (o.effect == 'scroll' && o.circular) {
                    return go(curr + o.steps)
                } else {
                    fadeab()
                }
            }
            //自定义函数
            function css(a, b) {
                return parseint($.css(a[0], b)) || 0
            };
        }
    })
})(jquery);