function pptbox() {
    this.uid = pptboxhelper.getid();
    pptboxhelper.instance[this.uid] = this;
    this._$ = function(id) { return document.getelementbyid(id); };
    this.width = 1270; //瀹藉害
    this.height = 355; //楂樺害
    this.picwidth = 19; //灏忓浘瀹藉害
    this.picheight = 19; //灏忓浘楂樺害
    this.autoplayer = 4; //鑷姩鎾斁闂撮殧锛堢锛?
    this.target = "_blank";
    this._box = [];
    this._curindex = 0;
}
pptbox.prototype =
    {
        _createmainbox: function() {
            var flashboxwidth = this.width * this._box.length + 0;
            var html = "<div id='" + this.uid + "_mainbox' class='mainbox'  style='width:" + (this.width) + "px;height:" + (this.height + 2) + "px;'>";
            html += "<div id='" + this.uid + "_flashbox' class='flashbox' style='width:" + flashboxwidth + "px;height:" + (this.height + 2) + "px;'></div>";
            html += "<div id='" + this.uid + "_imagebox' class='imagebox' style='width:" + this.width + "px;height:" + (this.picheight + 2) + "px;top:-" + (this.picheight + 50) + "px;'></div>";
            html += "</div>";
            document.write(html);
        },
        _init: function() {
            var picstyle = "";
            var eventstr = "pptboxhelper.instance['" + this.uid + "']";
            var imagehtml = "";
            var flashbox = "";
            for (var i = 0; i < this._box.length; i++) {
                var parame = this._box[i];
                flashbox += this.flashhtml(parame.url, this.width, this.height, i);
                imagehtml = "<div class='bitdiv " + ((i == 0) ? "curimg" : "defimg") + "' title =" + parame.title + " src='bit01.gif' " + picstyle + " onclick = \"" + eventstr + ".clickpic(" + i + ")\"  onmouseover=\"" + eventstr + ".mouseoverpic(" + i + ")\"></div>" + imagehtml;
            }
            this._$(this.uid + "_flashbox").innerhtml = flashbox;
            this._$(this.uid + "_imagebox").innerhtml = imagehtml;

        },
        _play: function() {
            clearinterval(this._autoplay);
            var idx = this._curindex + 1;
            if (idx >= this._box.length) { idx = 0; }
            this.changeindex(idx);
            var eventstr = "pptboxhelper.instance['" + this.uid + "']._play()";
            this._autoplay = setinterval(eventstr, this.autoplayer * 1270);

        },
        flashhtml: function(url, width, height, idx) {
            var isflash = url.substring(url.lastindexof('.') + 1).tolowercase() == "swf";
            var html = "";
            if (isflash) {
                html = "<object classid='clsid:d27cdb6e-ae6d-11cf-96b8-444553540000' "
                + "codebase='http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=7,0,19,0' width='" + width + "' height='" + height + "'>"
                + "<param name=\"movie\" value=\"" + url + "\" />"
                + "<param name='quality' value='high' />"
                + "<param name='wmode' value='transparent'>"
                + "<embed src='" + url + "' quality='high' wmode='opaque' pluginspage='http://www.macromedia.com/go/getflashplayer'"
                + "  type='application/x-shockwave-flash' width=" + width + " height='" + height + "'></embed>"
                + "  </object>";
            } else {
                var eventstr = "pptboxhelper.instance['" + this.uid + "']";
                var style = "";
                if (this._box[idx].href) {
                    style = "cursor:pointer"
                }
                html = "<img src='" + url + "' style='width:" + width + "px;height:" + height + "px;" + style + "' onclick = \"" + eventstr + ".clickpic(" + idx + ")\"/>";
            }
            return html;
        },
        changeindex: function(idx) {
            var parame = this._box[idx];
            moveelement(this.uid + "_flashbox", -(idx * this.width), 1);
            var imgs = this._$(this.uid + "_imagebox").getelementsbytagname("div");
            imgs[this._box.length - 1 - this._curindex].classname = "bitdiv defimg";
            imgs[this._box.length - 1 - idx].classname = "bitdiv curimg";
            this._curindex = idx;
        },
        mouseoverpic: function(idx) {
            this.changeindex(idx);
            if (this.autoplayer > 0) {
                clearinterval(this._autoplay);
                var eventstr = "pptboxhelper.instance['" + this.uid + "']._play()";
                this._autoplay = setinterval(eventstr, this.autoplayer * 1270);
            }
        },
        clickpic: function(idx) {
            var parame = this._box[idx];
            if (parame.href && parame.href != "") {
                window.open(parame.href, this.target);
            }
        },
        add: function(imgparam) {
            this._box[this._box.length] = imgparam;
        },
        show: function() {
            this._createmainbox();
            this._init();
            if (this.autoplayer > 0) {
                var eventstr = "pptboxhelper.instance['" + this.uid + "']._play()";
                this._autoplay = setinterval(eventstr, this.autoplayer * 1270);
            }
        }
    }
    var pptboxhelper =
    {
        count: 0,
        instance: {},
        getid: function() { return '_ppt_box-' + (this.count++); }
    };
    function moveelement(elementid, final_x, interval) {
        if (!document.getelementbyid) return false;
        if (!document.getelementbyid(elementid)) return false;
        var elem = document.getelementbyid(elementid);
        if (elem.movement) {
            cleartimeout(elem.movement);
        }
        if (!elem.style.left) {
            elem.style.left = "0px";
        }
        var xpos = parseint(elem.style.left);
        if (xpos == final_x) {
            return true;
        }
        if (xpos < final_x) {
            var dist = math.ceil((final_x - xpos) / 5);
            xpos = xpos + dist;
        }
        if (xpos > final_x) {
            var dist = math.ceil((xpos - final_x) / 5);
            xpos = xpos - dist;
        }
        elem.style.left = xpos + "px";
        var repeat = "moveelement('" + elementid + "'," + final_x + "," + interval + ")";
        elem.movement = settimeout(repeat, interval);
    }