;(function($,undefined){
    var _timer=[],
        _fw=window._fw=$.fn._fw=function(_){
            var i,name=[]
            for(i in _)
                if(_.hasOwnProperty(i))
                    name.push(i)
            $(this).each(function(){
                for(var i=0,opt;i<name.length;i++)
                    if(_fw.meth[name[i]])                       
                        opt=$.extend(clone(_fw.meth[name[i]]),_[name[i]]),
                        opt.init.call($(this).data(name[i],opt),opt)
            })
            return this
        },
        _meth=_fw.meth={},
        _hlp=_fw.hlp={
            clone:function(obj){
                if(!obj||typeof obj!=typeof {})
                    return obj
                if(obj instanceof Array)
                    return [].concat(obj)
                var tmp=new obj.constructor(),
                    i
                for(i in obj)
                    if(obj.hasOwnProperty(i))
                        tmp[i]=clone(obj[i])
                return tmp
            },
            srlz:function(str){
                if(!str)
                    return {}
                str=str.split(/[\/&]/)
                for(var i=0,tmp,ret={};i<str.length;i++)
                    if(str[i])
                        tmp=str[i].split('='),
                        ret[tmp[1]?tmp[0]:i]=tmp[1]?tmp[1]:tmp[0]
                return ret
            },
            dStr:function(obj){
                var key,
                    ret=''
                for(key in obj)
                    if(obj.hasOwnProperty(key))
                        if(key/1==''/1)
                            ret+=!ret?obj[key]+'/':obj[key]
                        else
                            ret+=!ret?key+'='+obj[key]+'&':key+'='+obj[key]
                return ret
            }
        },
        clone=_hlp.clone
        
$.fn.extend({
    bgSlider:function(opt){
        opt=opt||{}
        opt={bgSlider:opt}
        this._fw(opt)
    }
})

$.extend(_fw.meth,{
    bgSlider:{
            slideshow:false,
            duration:1500,
            easing:'',
            preload:false,
            pagination:false,
            pagActiveCl:'current',
            pagEv:'click',
            pagArea:'a',
            current:0,
            currN:0,
            method:'fit',
            altCSS:{},
            padding:0,
            preload:false,
            spinner:false,
            minSpinnerWait:150,
            preloadFu:function(){
                var opt=this,
                    img=$('<img>')
                            .css({position:'absolute',left:'999%'})
                            .appendTo('body'),
                    num=opt.images.length
                ;(function(){
                    if(num)
                        img .load(arguments.callee)
                            .attr({src:opt.images[--num]})
                    else
                        img.remove()                    
                })()
            },
            pagsFu:function(){
                var opt=this,
                    pags=opt.pags=$(opt.pagination+' li')
                if(!opt.images)
                    opt.images=[],
                    pags.each(function(i){
                        opt.images.push($('a',this).attr('href'))
                    })
                pags.find(opt.pagArea).each(function(i){
                    $(this).data({num:i})
                })
                pags.parent()
                    .delegate(opt.pagination+':not(.'+opt.pagActiveCl+')'+(opt.pagArea?' '+opt.pagArea:''),opt.pagEv,function(){
                        var th=$(this)
                        opt.changeFu(th.data('num'))
                        opt.pags.not(th.parent().addClass(opt.pagActiveCl)).removeClass(opt.pagActiveCl)                        
                        return false
                    })
            },
            preFu:function(){
                var opt=this
                opt.img
                    .css({
                        position:'absolute',
                        left:0,
                        top:0
                        })
                    .css(opt.altCSS)
                    .attr({src:opt.images[opt.current]})                    
                opt.img.each(function(){
                    var _f=function(){
                                opt.resizeFu()
                                opt.img.data({width:opt.img.width(),height:opt.img.height()})                       
                            }
                    if(this.complete)
                        _f()
                    else
                        $(this)
                            .load(_f)
                })
                    
                opt.holder
                    .css({
                        position:'fixed',
                        left:0,
                        right:0,
                        top:0,
                        bottom:0,
                        zIndex:-1
                        })
                    .append(opt.img)
                if(opt.spinner)
                    opt.spinner.hide()
            },
            resizeFu:function(){
                var opt=this,
                    img=opt.img,
                    w=opt.wi,
                    h=opt.he,
                    l=img.css('left'),
                    t=img.css('top'),
                    bw=document.body.offsetWidth-opt.padding,
                    bh=document.body.offsetHeight,
                    k=w/h
                if(opt.method=='fit')
                    if(bw/bh<k)
                        img.width('auto').height(bh).css({top:t,left:l})
                    else
                        img.width(bw).height('auto').css({top:t,left:l})
                else
                    if(!(bw/bh<k))
                        img.width('auto').height(bh).css({top:t,left:l})
                    else
                        img.width(bw).height('auto').css({top:t,left:l})
            },
            changeFu:function(n){
                var opt=this
                if(n==opt.currN)
                    return false
                opt.currN=n
                opt.showFu(opt.images[n])
            },
            nextFu:function(){
                var opt=this,
                    n=opt.currN
                opt.changeFu(++n<opt.images.length?n:n=0)
                opt.pags.eq(n).addClass(opt.pagActiveCl).siblings().removeClass(opt.pagActiveCl)
            },
            prevFu:function(){
                var opt=this,
                    n=opt.currN
                opt.changeFu(--n>=0?n:n=opt.images.length-1)
                opt.pags.eq(n).addClass(opt.pagActiveCl).siblings().removeClass(opt.pagActiveCl)
            },
            showFu:function(src){
                var opt=this,
                    clone=opt.clone=opt.img.clone(true)
                if(opt.slideshow)
                    clearInterval(_timer[0])
                clone
                    .css({
                         opacity:0,
                         left:0,
                         top:0
                         })
                    .appendTo(opt.holder)   
                    .width(opt.img.width())
                    .load(function(){
                        var th=$(this)
                        opt.holder.find('>*').stop()                        
                        setTimeout(function(){
                            opt.spinner.hide()
                            opt.wi=th.width()
                            opt.he=th.height()
                            clone
                                .stop()
                                .animate({
                                        opacity:1
                                        },{
                                        duration:opt.duration,
                                        easing:opt.easing,
                                        complete:function(){
                                            var tmp=opt.holder.find('img')
                                            opt.img=$(this)
                                            tmp.not(tmp.last()).remove()
                                            opt.resizeFu()
                                        }
                                        })
                        },opt.minSpinnerWait)
                    })
                    .attr({src:src})
                    opt.spinner.show()
                    if(opt.slideshow)
                        _timer[0]=setInterval(function(){
                            opt.nextFu()
                        },opt.slideshow)
            },
            init:function(opt){
                var holder=opt.holder=this,
                    img=opt.img=$('<img>')
                if(opt.pagination)
                    opt.pagsFu()
                if(opt.spinner)
                    opt.spinner=$(opt.spinner)
                opt.preFu()
                if(opt.preload)
                    opt.preloadFu()
                window.onresize=function(){
                    opt.resizeFu()
                }
                if(opt.slideshow)
                    _timer[0]=setInterval(function(){
                        opt.nextFu()
                    },opt.slideshow)
                holder.data({opt:opt})
            }
        }
})
})(jQuery)