/*
对联广告调用
第一个参数为ID,第二个参数图片,第三个参数广告距离顶部的距离,
第四个参数表示左右(true代表左,false代表右),第五个参数对联广告的宽度
*/
//new float_ad("ad_l", "<img src='/System/uploads/allimg/090504/2346400.gif' />", 50, true, 64);
//new float_ad("ad_r", "<img src='/System/uploads/allimg/090504/2346400.gif' />", 50, false, 64);

/*
漂浮广告调用
第一个参数中的url代表漂浮广告的图片URL地址(必选项),link链接到页面网址,alt图片提示文字,width图片的宽度(可选项,默认120),heihgt图片的高度(可选项,默认120)
第二个参数中的代表漂浮广告的初始位置,由参数left和top指定
第三个参数代表浮动速度，0为静止，越小浮动速度越快
*/
//new move_ad({ url: "/System/uploads/allimg/090504/2346400.gif", link: "http://jzyouth.org.cn/html/zixun/zuixingonggao/2009327/zxgg47926848.html", alt: "关于招募“2009中国·大连国际樱桃节”志愿者的通知", width: 200, height: 200 }, { left: 40, top: 160 }, 20);

//核心代码
function getElement(element) {
    if (arguments.length > 1) {
        for (var i = 0, elements = [], length = arguments.length; i < length; i++)
            elements.push(getElement(arguments[i]));
        return elements;
    }
    if (typeof element == "string")
        return document.getElementById(element);
    else
        return element;
}
Function.prototype.bind = function(object) {
    var method = this;
    return function() {
        method.apply(object, arguments);
    }
}
var Class = {
    create: function() {
        return function() {
            this.initialize.apply(this, arguments);
        }
    }
}
Object.extend = function(destination, resource) {
    for (var property in resource) {
        destination[property] = resource[property];
    }
    return destination;
}
//对联广告类http://www.knowsky.com/article.asp?typeid=36
var float_ad = Class.create();
float_ad.prototype = {
    initialize: function(id, content, top, left, width) {
        document.write('<div id=' + id + ' style="position:absolute;">' + content + '</div>');
        this.id = getElement(id);
        this.top = top;
        if (!!left) {
            this.id.style.left = "8px";
        } else {
            this.id.style.left = (document.documentElement.clientWidth - width - 8) + "px";
            window.onresize = function() {
                this.id.style.left = (document.documentElement.clientWidth - width - 8) + "px";
            } .bind(this);
        }
        this.id.style.top = top + "px";

        this.interId = setInterval(this.scroll.bind(this), 20);
    },
    scroll: function() {
        this.stmnStartPoint = parseInt(this.id.style.top, 10);
        this.stmnEndPoint = document.documentElement.scrollTop + this.top;
        if (navigator.userAgent.indexOf("Chrome") > 0) {
            this.stmnEndPoint = document.body.scrollTop + this.top;
        }
        if (this.stmnStartPoint != this.stmnEndPoint) {
            this.stmnScrollAmount = Math.ceil(Math.abs(this.stmnEndPoint - this.stmnStartPoint) / 15);
            this.id.style.top = parseInt(this.id.style.top, 10) + ((this.stmnEndPoint < this.stmnStartPoint) ? -this.stmnScrollAmount : this.stmnScrollAmount) + "px";
        }
    }
}
//漂浮广告类
var move_ad = Class.create();
move_ad.prototype = {
    initialize: function(imgOption, initPosition, delay) {
        this.imgOptions = Object.extend({ url: "", link: "", alt: "", width: 120, height: 120 }, imgOption || {});
        this.adPosition = Object.extend({ left: 40, top: 120 }, initPosition || {});
        this.delay = delay;
        this.step = 1;
        this.herizonFlag = true;
        this.verticleFlag = true;
        this.id = "ad_move_sg";
        var vHtmlString = "<div id='" + this.id + "' style='position:absolute; left:" + this.adPosition.left + "px; top:" + this.adPosition.top + "px; width:" + this.imgOptions.width + "px;";
        vHtmlString += " height:" + this.imgOptions.height + "px; z-index:10;'><a href='" + this.imgOptions.link + "' target='_blank' title='" + this.imgOptions.alt + "'><img src='" + this.imgOptions.url + "' width='" + this.imgOptions.width + "' height='" + this.imgOptions.height + "' style='border:none;' alt='" + this.imgOptions.alt + "' /></a></div>";
        document.write(vHtmlString);
        this.id = getElement(this.id);
        this.intervalId = setInterval(this.scroll.bind(this), this.delay);
        this.id.onmouseover = this.stop.bind(this);
        this.id.onmouseout = this.start.bind(this);
    },
    scroll: function() {
        var L = T = 0;
        var B = document.documentElement.clientHeight - this.id.offsetHeight;
        var R = document.documentElement.clientWidth - this.id.offsetWidth;
        this.id.style.left = this.adPosition.left + document.documentElement.scrollLeft + "px";
        this.id.style.top = this.adPosition.top + document.documentElement.scrollTop + "px";
        this.adPosition.left = this.adPosition.left + this.step * (this.herizonFlag ? 1 : -1);
        if (this.adPosition.left < L) { this.herizonFlag = true; this.adPosition.left = L; }
        if (this.adPosition.left > R) { this.herizonFlag = false; this.adPosition.left = R; }
        this.adPosition.top = this.adPosition.top + this.step * (this.verticleFlag ? 1 : -1);
        if (this.adPosition.top <= T) { this.verticleFlag = true; this.adPosition.top = T; }
        if (this.adPosition.top >= B) { this.verticleFlag = false; this.adPosition.top = B; }
    },
    stop: function() {
        clearInterval(this.intervalId);
    },
    start: function() {
        this.intervalId = setInterval(this.scroll.bind(this), this.delay);
    }
}