window.onresize = resizeDiv; //根据窗体高度和宽度，改变短消息提示框的高度和宽度 
window.onerror = function(){} //出现错误时，不做任何处理 
var divTop,divLeft,divWidth,divHeight,docHeight,docWidth,objTimer,i = 0;//关于位置的相关变量 
function $int(num){try{return parseInt(num);}catch(ex){return 0;}}
function viewMsg() { 
    try{ 
        var divElement = $(divName);
        divTop = $int(divElement.style.top) //div的x坐标 
        divLeft = $int(divElement.style.left) //div的y坐标 
        divHeight = $int(divElement.offsetHeight)//div的高度 
        divWidth = $int(divElement.offsetWidth) //div的宽度 
        docWidth = document.documentElement.clientWidth; //窗体宽度 
        docHeight = document.documentElement.clientHeight; //窗体高度 
        divElement.style.top = docHeight + 10;//设置div的Y坐标 
        divElement.style.left = docWidth - divWidth//设置div的X坐标 
        divElement.style.visibility="visible" //设置div显示 
        objTimer = window.setInterval("moveDiv()",10) //设置定时器 
    }catch(e){alert("viewMsg"+e.description);} 
} 
function resizeDiv(){ 
    i+=1 
    if (i>500) closeDiv() 
    try{ 
        var divElement = $(divName);
        divHeight = $int(divElement.offsetHeight) //设置div高度 
        divWidth = $int(divElement.offsetWidth) //设置div宽度 
        docWidth = document.documentElement.clientWidth; //获取窗体宽度 
        docHeight = document.documentElement.clientHeight; //设置窗体高度 
        divElement.style.top = docHeight - divHeight;// + $int(document.body.scrollTop)//设置div的y坐标 
        divElement.style.left = docWidth - divWidth;// + $int(document.body.scrollLeft)//设置div的x坐标 
    }catch(e){alert("resizeDiv"+e.description);} 
} 
function moveDiv(){ 
    try{ 
        var divElement = $(divName);
        if ($int(divElement.style.top) <= (docHeight - divHeight)){ 
            window.clearInterval(objTimer) 
            objTimer = window.setInterval("resizeDiv()",1) //调整div的位置和大小 
        } 
        divTop = $int(divElement.style.top)//获取y坐标 
        divElement.style.top = divTop - 1//调整div的Y坐标 
    } 
    catch(e){alert("moveDiv"+e.description);} 
} 
function closeDiv(){ 
    var divElement = $(divName);
    divElement.style.visibility='hidden';//将短信息提示层隐藏 
    if(objTimer) window.clearInterval(objTimer); //清除定时器 
}

------解决方案--------------------
前台：
C# code

 <input type="hidden" onclick="viewMsg()" runat="server" id="hidMsg" value="0" />
    <div id="divMsg" style="border-right: #455690 1px solid; border-top: #a6b4cf 1px solid;
        z-index: 99999; left: 0px; visibility: hidden; border-left: #a6b4cf 1px solid;
        width: 180px; border-bottom: #455690 1px solid; position: absolute; top: 0px;
        height: 116px; background-color: #c9d3f3">
        <table style="border-top: #ffffff 1px solid; border-left: #ffffff 1px solid" cellspacing="0"
            cellpadding="0" width="100%" bgcolor="#cfdef4" border="0">
            <tbody>
                <tr>
                    <td style="font-size: 12px; color: #0f2c8c" width="30" height="24">
                    </td>
                    <td style="font-weight: normal; font-size: 12px; color: #1f336b; padding-top: 4px;
                        padding-left: 4px" valign="center" width="100%">
                        Mac审批提示：</td>