2个服务器控件调用JS函数的问题

Question

为什么我2个图片调用进度条加载时只有Image1才显示进度条而Image2没显示出来了
protected void Page_Load(object sender, EventArgs e)
    {
        //单个调用js        Image1.Attributes.Add("onreadystatechange", "onLoadObj(this, 'mLoading');");
        Image1.Attributes.Add("onload", "onLoadObj(this,'mLoading');");        Image2.Attributes.Add("onreadystatechange", "onLoadObj(this, 'mLoading');");
        Image2.Attributes.Add("onload", "onLoadObj(this,'mLoading');");   
    }js代码
function onLoadObj(sender, loadid) {
    var _mLoading = get(loadid);
    sender.async = true;
    _mLoading.style.display = "inline";
    _mLoading.style.top = (sender.clientHeight / 2) + "px";
    _mLoading.style.left = sender.offsetLeft + "px";
    if (navigator.userAgent.indexOf("MSIE") > 0) {
        if (sender.readyState == "complete") {
            _mLoading.style.display = "none";
        }
    } else {        _mLoading.style.display = "none";    }
}

Answer 1

loadid 你是相同的。。mLoading

Answer 2

这是前台页面
<div id="mLoading" class="loading">
        <ul>
            <li>
                <img src="http://sysimages.tq.cn/images/analysis_images/ajax-loader.gif" alt="" />
            </li>
            <li><span style="margin-top: 9px;">Loading... </span></li>
        </ul>
    </div>
    <div id="mBox" style="padding-left: 3px; padding-right: 3px; padding-bottom: 2px;
        height: 100%">
        <asp:Image ID="Image1" runat="server" ImageUrl="http://img1.jike.com:82/get?name=T1BdYEBT_y1RCvBVdK"
            Width="200px" />
        <asp:Image ID="Image2" runat="server" ImageUrl="http://img1.jike.com:82/get?name=T1BdYEBT_y1RCvBVdK"
            Width="200px" />
    </div>