javascript，使页面上的文字定时消失解决方案

javascript，使页面上的文字定时消失
function claerLabel()
{
var col = new Array();
col[15] = '#000000';
col[14] = '#111111';
col[13] = '#222222';
col[12] = '#333333';
col[11] = '#444444';
col[10] = '#555555';
col[9] = '#666666';
col[8] = '#777777';
col[7] = '#888888';
col[6] = '#999999';
col[5] = '#AAAAAA';
col[4] = '#BBBBBB';
col[3] = '#CCCCCC';
col[2] = '#DDDDDD';
col[1] = '#EEEEEE';
col[0] = '#FFFFFF';
var i = col.length;
var isOut = true;

function over()
{
if (i>=0 && isOut)
{
i--;
document.getElementById("ctl00_ContentPlaceHolder2_lblErrorRefNo").style.color=col[i];
alert(i);
}
else if(i<= col.length && !isOut)
{
i++;
document.getElementById("ctl00_ContentPlaceHolder2_lblErrorRefNo").style.color=col[i];
}
else
{
isOut = !isOut;
}

setTimeout('over()',100);
}
over();
//document.getElementById("ctl00_ContentPlaceHolder2_lblErrorRefNo").innerText = '';
}

大家帮帮看看我写的代码，我想在网页上的提示信息（即，ctl00_ContentPlaceHolder2_lblErrorRefNo得值）渐渐消失，写得这种方法，但是运行时出错，请高人帮忙分析一下

------解决方案--------------------

HTML code


<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>未命名頁面</title>
    <script type="text/javascript">
    
    var col = new Array(); 
    col[15] = '#000000';      
    col[14] = '#111111';      
    col[13] = '#222222';      
    col[12] = '#333333';      
    col[11] = '#444444';      
    col[10] = '#555555';      
    col[9] =  '#666666';      
    col[8] =  '#777777';      
    col[7] =  '#888888';      
    col[6] =  '#999999';      
    col[5] =  '#AAAAAA';      
    col[4] =  '#BBBBBB';      
    col[3] =  '#CCCCCC';      
    col[2] =  '#DDDDDD';      
    col[1] =  '#EEEEEE';      
    col[0] =  '#FFFFFF';    
    var i = col.length; 
    var isOut = true;     

    function pageLoad() 
    {
        over();
    }
    
    function over()
    {    
        if (i>=0 && isOut)
        { 
            i--; 
            document.getElementById("Text1").style.color=col[i]; 
            //alert(i); 
        } 
        else if(i <= 14 && !isOut) 
        { 
            i++; 
            document.getElementById("Text1").style.color=col[i]; 
        } 
        else 
        { 
            isOut = !isOut; 
        }

        setTimeout('over()',100);  
    } 
    </script>
    
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:ScriptManager ID="ScriptManager1" runat="server" />
    </div>
        <input id="Text1" type="text" value="中文" />
    </form>
</body>
</html>

------解决方案--------------------

javascript，使页面上的文字定时消失解决方案

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