右下角即时弹出框

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="E_PopTip.ascx.cs" Inherits="Control_E_PopTip" %>
<script language="JavaScript"> 
    //写cookies函数
    function SetCookie(name,value)//两个参数，一个是cookie的名子，一个是值
    {
        var Days = 1; //此 cookie 将被保存 30 天
        var exp  = new Date();    //new Date("December 31, 9998");
        exp.setTime(exp.getTime() + Days*24*60*60*1000);
        document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();
    }
    function getCookie(name)//取cookies函数        
    {
        var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));
         if(arr != null) return unescape(arr[2]); return null;

    }
    function delCookie(name)//删除cookie
    {
        var exp = new Date();
        exp.setTime(exp.getTime() - 1);
        var cval=getCookie(name);
        if(cval!=null) document.cookie= name + "="+cval+";expires="+exp.toGMTString();
    }
    function trim(str){  //删除左右两端的空格
        return str.replace(/(^\s*)|(\s*$)/g, "");
    }

	if (window.XMLHttpRequest) 
	{
		req = new XMLHttpRequest();
	} 
	else if (window.ActiveXObject) 
	{
		req = new ActiveXObject("Microsoft.XMLHTTP");
	}

	req.open("get", "PopTip.aspx?act=sendmsg&t=" + Math.random());
	req.onreadystatechange=RequestCallBack;
	req.send();
		
	function RequestCallBack(){
        if (req.readyState == 4) {
		    if (req.status == 200) {
			    var check_num=trim(req.responseText);
	            if(check_num!="")
	            {
			        if(getCookie("check_num")==check_num)
			        {
                        window.setInterval("getMsg()", 1800000);
			        }
			        else
			        {
			            getMsg();
			            SetCookie("check_num",check_num);
			        }	        
			    }
		    }
	    }		    
    }


    var divTop,divLeft,divWidth,divHeight,docHeight,docWidth,objTimer,i = 0; 
    function getMsg() 
    {
        try{ 
            divTop = parseInt(document.getElementById("eMeng").style.top,10) 
            divLeft = parseInt(document.getElementById("eMeng").style.left,10) 
            divHeight = parseInt(document.getElementById("eMeng").offsetHeight,10) 
            divWidth = parseInt(document.getElementById("eMeng").offsetWidth,10) 
            docWidth = document.documentElement.clientWidth; 
            docHeight = document.documentElement.clientHeight; 
            document.getElementById("eMeng").style.top =( parseInt(document.documentElement.scrollTop,10) + docHeight + 10)+"px";// divHeight 
            document.getElementById("eMeng").style.left =( parseInt(document.documentElement.scrollLeft,10) + docWidth - divWidth )+"px";
            document.getElementById("eMeng").style.visibility="visible" 
            objTimer = window.setInterval("moveDiv()",10) 
        } 
        catch(e){}
    } 

    function resizeDiv() 
    { 
        i+=1  
        if(i>1200) closeDiv() //想不用自动消失由用户来自己关闭所以屏蔽这句
        try{ 
        divHeight = parseInt(document.getElementById("eMeng").offsetHeight,10) 
        divWidth = parseInt(document.getElementById("eMeng").offsetWidth,10) 
        docWidth = document.documentElement.clientWidth; 
        docHeight = document.documentElement.clientHeight; 
        document.getElementById("eMeng").style.top = docHeight - divHeight + parseInt(document.documentElement.scrollTop,10) 
        document.getElementById("eMeng").style.left = docWidth - divWidth + parseInt(document.documentElement.scrollLeft,10) 
        } 
        catch(e){} 
    } 

    function moveDiv() 
    { 
        try 
        { 
            if(parseInt(document.getElementById("eMeng").style.top,10) <= (docHeight - divHeight + parseInt(document.documentElement.scrollTop,10))) 
            { 
                window.clearInterval(objTimer) 
                objTimer = window.setInterval("resizeDiv()",1) 
            } 
            divTop = parseInt(document.getElementById("eMeng").style.top,10) 
            document.getElementById("eMeng").style.top = (divTop - 1 )+"px";
        } 
        catch(e){} 
    } 
    function closeDiv() 
    { 
        document.getElementById('eMeng').style.visibility='hidden'; 
        if(objTimer) window.clearInterval(objTimer) 
    } 
    </script>
    <DIV id=eMeng style="BORDER: #a6b4cf 1px solid;  Z-INDEX:99999; LEFT: 0px; VISIBILITY: hidden;  WIDTH: 200px; POSITION: absolute; TOP: 0px; HEIGHT: 150px; BACKGROUND-COLOR: #c9d3f3"> 
    <TABLE style="BORDER-TOP: #ffffff 1px solid; BORDER-LEFT: #ffffff 1px solid;height:150px;" cellSpacing=0 cellPadding=0 width="100%" bgColor=#cfdef4 border=0> 
    <TBODY> 
    <TR> 
    <TD style="FONT-SIZE: 12px; BACKGROUND-IMAGE: url(msgTopBg.gif); COLOR: #0f2c8c" width=30 height=24></TD> 
    <TD style="FONT-WEIGHT: normal; FONT-SIZE: 12px; BACKGROUND-IMAGE: url(msgTopBg.gif); COLOR: #1f336b; PADDING-TOP: 4px;PADDING-left: 4px;" vAlign=center width="100%"> 消息提示：</TD> 
    <TD style="BACKGROUND-IMAGE: url(msgTopBg.gif); PADDING-TOP: 2px;PADDING-right:2px" vAlign=center align=right width=19><span title=关闭 style="CURSOR: hand;color:red;font-size:12px;font-weight:bold;margin-right:4px;" onclick=closeDiv() >×</span></TD> 
    </TR> 
    <TR> 
    <TD style="PADDING-RIGHT: 1px; BACKGROUND-IMAGE: url(1msgBottomBg.jpg); PADDING-BOTTOM: 1px" colSpan=3 height=102> 
    <DIV style="BORDER-RIGHT: #b9c9ef 1px solid;BORDER-TOP: #728eb8 1px solid; PADDING-LEFT: 1px; FONT-SIZE: 12px; PADDING-BOTTOM: 10px; BORDER-LEFT: #728eb8 1px solid; WIDTH: 100%; COLOR: #1f336b; PADDING-TOP: 10px; BORDER-BOTTOM: #b9c9ef 1px solid; HEIGHT: 100%">
        <DIV align=left style="word-break:break-all"><%=show_Msg() %></DIV>
    </DIV> 
    </TD> 
    </TR> 
    </TBODY> 
    </TABLE> 
    </DIV>