/*
*表示必须,非必须项的第一个选项选项为默认选项
url(*)     Flash或图片的地址
type:flash/image 类型
href     图片的目标链接，只有当type为image时才有效
width:80/任意数字 宽度
height:80/任意数字 高度
x:right/left   水平位置
xPx:1/任意数字   水平方向上Logo左边(右边)到浏览窗口左边（右边）的像素值
y:bottom/top   垂直位置
yPx:10/任意数字   垂直方向上Logo顶边(底边)到浏览窗口顶边（底边）的像素值
id:''/任意合法ID flash的id
*/

var nadFloatLogo = function (url, options) {
    if (nadIsLtIE5_5()) { return; }
    this.url = url;
    this.options = {
        type: 'flash',
        width: 118,
        height: 234,
        x: 'left',
        xPx: 1,
        y: 'top',
        yPx: 80,
        id: 'iit'
    }
    Object.nadExtend(this.options, options || {});
    this.create();
    nadAddEventListener(window, 'resize', this.float.nadBind(this));
    nadAddEventListener(window, 'scroll', this.float.nadBind(this));
}
nadFloatLogo.prototype = {
    create: function () {
        var oA = document.createElement('a');
        this.ad = oA;
        var _url = this.url;
        var _opt = this.options;
        var _width = _opt.width;
        var _height = _opt.height;
        var _id = _opt.id;
        oA.style.position = 'absolute';
        oA.style.border = '0';
        oA.target = '_blank';
        oA.style[_opt.x] = _opt.xPx + 'px';
        var _ch = nadClientHeight();
        this.positionY(0, _ch, _height, _opt.yPx);
        this.initSt = 0;
        this.initCh = _ch;
        if (_opt.href) { oA.href = _opt.href; }
        if (_opt.type == 'flash') {
            oA.innerHTML = nadCreateSwfHtml(_url, _opt.id, {
                width: _width,
                height: _height,
                wmode: 'window'
            });
        }
        if (_opt.type == 'image') {
            oA.innerHTML = '<img src="' + _url + '" width="' + _width + '" height="' + _height + '" alt="" border="0" id="' + _id + '" STYLE="position:absolute;TOP:5pt;LEFT:5pt;Z-INDEX:10;visibility:visible;"/>'
        }
        document.getElementById("OuterDiv").appendChild(oA);
    },
    positionY: function (st, ch, height, yPx) {
        var _ad = this.ad;
        if (this.options.y == 'bottom') {
            _ad.style.top = st + ch - height - yPx + 'px';
        } else {
            _ad.style.top = st + yPx + 'px';
        }
    },
    move: function () {
        var _initSt = this.initSt;
        var _initCh = this.initCh;
        var _ad = this.ad;
        var _opt = this.options;
        var _st = nadScrollTop();
        var _ch = nadClientHeight();

        if (_initSt != _st || _initCh != _ch) {
            if (_initSt != _st) {
                _st = _initSt + (_st - _initSt) / 2;
                this.initSt = _st;
            }
            if (_initCh != _ch) { this.initCh = _ch; }
            this.positionY(_st, _ch, _opt.height, _opt.yPx);
        } else { clearInterval(this.intervalId); }

    },
    float: function () {
        clearInterval(this.intervalId);
        this.intervalId = setInterval(this.move.nadBind(this), 100)
    }
}
/*==common function begin==*/
var nadUserAgent = navigator.userAgent;
var nadIsOpera = nadUserAgent.indexOf('Opera') > -1
var nadIsIE = nadUserAgent.indexOf('MSIE') > -1 && !nadIsOpera;
var nadIsLtIE5_5 = function () {
    if (nadIsIE) {
        var reIE = new RegExp('MSIE (\\d+\\.\\d+);');
        reIE.test(nadUserAgent);
        var IeVersion = parseFloat(RegExp["$1"]);
        return IeVersion < 5.5;
    }
}
nadScrollTop = function () {
    return document.documentElement.scrollTop ? document.documentElement.scrollTop : document.body.scrollTop;
}
nadClientHeight = function () {
    return (document.body.clientHeight > document.documentElement.clientHeight) && (document.documentElement.clientHeight != 0) ? document.documentElement.clientHeight : document.body.clientHeight;
}
Object.nadExtend = function (destination, source) {
    for (var property in source) {
        destination[property] = source[property];
    }
    return destination;
}
Function.prototype.nadBind = function () {
    var __method = this, args = $nadA(arguments), object = args.shift();
    return function () {
        return __method.apply(object, args.concat($nadA(arguments)));
    }
}
var $nadA = function (iterable) {
    if (!iterable) return [];
    if (iterable.toArray) {
        return iterable.toArray();
    } else {
        var results = [];
        for (var i = 0, length = iterable.length; i < length; i++)
            results.push(iterable[i]);
        return results;
    }
}
var nadAddEventListener = function (obj, e, f) {
    if (document.addEventListener) { obj.addEventListener(e, f, false); }
    else {
        e = 'on' + e;
        obj.attachEvent(e, f);
    }
}
var nadCreateSwfHtml = function (url, id, options) {
    var swfHtml = '';
    if (!url) { return; }
    _opt = options;
    if (nadIsIE) {
        swfHtml += '<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,0,0" width="' + _opt.width + '" height="' + _opt.height + '" id="' + id + '">';
        swfHtml += '<param name="movie" value="' + url + '" />';
        swfHtml += '<param name="quality" value="high" />';
        swfHtml += '<param name="wmode" value="' + _opt.wmode + '" />';
        swfHtml += '</object>';
    }
    else {
        swfHtml += '<embed src="' + url + '" quality="high" pluginspage="http://www.macromedia.com/go/getflashplayer" type="application/x-shockwave-flash" width="' + _opt.width + '" height="' + _opt.height + '" wmode="' + _opt.wmode + '" id="' + id + '" name="' + id + '" swliveconnect="true"></embed>'
    }
    return swfHtml;
}
/*==common function end==*/