var QianboNavMenu={
transition: {overtime:300, outtime:300},
shadow: {enable:true, offsetx:5, offsety:5},
showhidedelay: {showdelay: 100, hidedelay: 200},
detectwebkit: navigator.userAgent.toLowerCase().indexOf("applewebkit")!=-1,
detectie6: document.all && !window.XMLHttpRequest,
css3support: window.msPerformance || (!document.all && document.querySelector),
getajaxmenu:function($, setting){
    var $menucontainer=$('#'+setting.contentsource[0])
    $menucontainer.html("菜单载入中…")
    $.ajax({
        url: setting.contentsource[1],
        async: true,
        error:function(ajaxrequest){
            $menucontainer.html('参数获取错误：'+ajaxrequest.responseText)
        },
        success:function(content){
            $menucontainer.html(content)
            QianboNavMenu.buildmenu($, setting)
        }
    })
},
buildmenu:function($, setting){
    var smoothmenu=QianboNavMenu
    var $mainmenu=$("#"+setting.mainmenuid+">ul")
    $mainmenu.parent().get(0).className=setting.classname || "QianboNavMenu"
    var $headers=$mainmenu.find("ul").parent()
    $headers.hover(
        function(e){
            $(this).children('a:eq(0)').addClass('selected')
        },
        function(e){
            $(this).children('a:eq(0)').removeClass('selected')
        }
    )
    $headers.each(function(i){
        var $curobj=$(this).css({zIndex: 100-i})
        var $subul=$(this).find('ul:eq(0)').css({display:'block'})
        $subul.data('timers', {})
        this._dimensions={w:this.offsetWidth, h:this.offsetHeight, subulw:$subul.outerWidth(), subulh:$subul.outerHeight()}
        this.istopheader=$curobj.parents("ul").length==1? true : false
        $subul.css({top:this.istopheader && setting.orientation!='v'? this._dimensions.h+"px" : 0})
        if (smoothmenu.shadow.enable && !smoothmenu.css3support){
            this._shadowoffset={x:(this.istopheader?$subul.offset().left+smoothmenu.shadow.offsetx : this._dimensions.w), y:(this.istopheader? $subul.offset().top+smoothmenu.shadow.offsety : $curobj.position().top)}
            if (this.istopheader)
                $parentshadow=$(document.body)
            else{
                var $parentLi=$curobj.parents("li:eq(0)")
                $parentshadow=$parentLi.get(0).$shadow
            }
            this.$shadow=$('<div class="ddshadow'+(this.istopheader? ' toplevelshadow' : '')+'"></div>').prependTo($parentshadow).css({left:this._shadowoffset.x+'px', top:this._shadowoffset.y+'px'})
        }
        $curobj.hover(
            function(e){
                var $targetul=$subul
                var header=$curobj.get(0)
                clearTimeout($targetul.data('timers').hidetimer)
                $targetul.data('timers').showtimer=setTimeout(function(){
                    header._offsets={left:$curobj.offset().left, top:$curobj.offset().top}
                    var menuleft=header.istopheader && setting.orientation!='v'? 0 : header._dimensions.w
                    menuleft=(header._offsets.left+menuleft+header._dimensions.subulw>$(window).width())? (header.istopheader && setting.orientation!='v'? -header._dimensions.subulw+header._dimensions.w : -header._dimensions.w) : menuleft
                    if ($targetul.queue().length<=1){
                        $targetul.css({left:menuleft+"px", width:header._dimensions.subulw+'px'}).animate({height:'show',opacity:'show'}, QianboNavMenu.transition.overtime)
                        if (smoothmenu.shadow.enable && !smoothmenu.css3support){
                            var shadowleft=header.istopheader? $targetul.offset().left+QianboNavMenu.shadow.offsetx : menuleft
                            var shadowtop=header.istopheader?$targetul.offset().top+smoothmenu.shadow.offsety : header._shadowoffset.y
                            if (!header.istopheader && QianboNavMenu.detectwebkit){
                                header.$shadow.css({opacity:1})
                            }
                            header.$shadow.css({overflow:'', width:header._dimensions.subulw+'px', left:shadowleft+'px', top:shadowtop+'px'}).animate({height:header._dimensions.subulh+'px'}, QianboNavMenu.transition.overtime)
                        }
                    }
                }, QianboNavMenu.showhidedelay.showdelay)
            },
            function(e){
                var $targetul=$subul
                var header=$curobj.get(0)
                clearTimeout($targetul.data('timers').showtimer)
                $targetul.data('timers').hidetimer=setTimeout(function(){
                    $targetul.animate({height:'hide', opacity:'hide'}, QianboNavMenu.transition.outtime)
                    if (smoothmenu.shadow.enable && !smoothmenu.css3support){
                        if (QianboNavMenu.detectwebkit){
                            header.$shadow.children('div:eq(0)').css({opacity:0})
                        }
                        header.$shadow.css({overflow:'hidden'}).animate({height:0}, QianboNavMenu.transition.outtime)
                    }
                }, QianboNavMenu.showhidedelay.hidedelay)
            }
        )
    })
    if (smoothmenu.shadow.enable && smoothmenu.css3support){
        var $toplevelul=$('#'+setting.mainmenuid+' ul li ul')
        var css3shadow=parseInt(smoothmenu.shadow.offsetx)+"px "+parseInt(smoothmenu.shadow.offsety)+"px 5px #aaa"
        var shadowprop=["boxShadow", "MozBoxShadow", "WebkitBoxShadow", "MsBoxShadow"]
        for (var i=0; i<shadowprop.length; i++){
            $toplevelul.css(shadowprop[i], css3shadow)
        }
    }
    $mainmenu.find("ul").css({display:'none', visibility:'visible'})
},
init:function(setting){
    if (typeof setting.customtheme=="object" && setting.customtheme.length==2){
        var mainmenuid='#'+setting.mainmenuid
        var mainselector=(setting.orientation=="v")? mainmenuid : mainmenuid+', '+mainmenuid
        document.write('<style type="text/css">\n'
            +mainselector+' ul li a {background:'+setting.customtheme[0]+';}\n'
            +mainmenuid+' ul li a:hover {background:'+setting.customtheme[1]+';}\n'
        +'</style>')
    }
    this.shadow.enable=(document.all && !window.XMLHttpRequest)? false : this.shadow.enable
    jQuery(document).ready(function($){
        if (typeof setting.contentsource=="object"){
            QianboNavMenu.getajaxmenu($, setting)
        }
        else{
            QianboNavMenu.buildmenu($, setting)
        }
    })
}
}