How to set numeric entry in textbox by calling a js file ?

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VS2005

C#2.0

C#

Javascript

, +

I am having a js file which is called for integer entry in textbox as follows:

function Numeric_Text_KeyDown(event)
{
    var iKeyCode = event.keyCode;
    //alert(iKeyCode);
    if ( (event.ctrlKey) || (event.altKey)) return false;

    if (iKeyCode == 38 || iKeyCode == 40 || iKeyCode == 13 || iKeyCode == 9 ||
    iKeyCode == 8 || iKeyCode == 46 ||iKeyCode == 39 ||iKeyCode == 37 ||
    iKeyCode == 229 ||((iKeyCode > 47 && iKeyCode < 58) && !(event.shiftKey) ) ||
    (iKeyCode > 111 && iKeyCode < 124) ||(iKeyCode > 95 && iKeyCode < 106))
    {

        if (iKeyCode == 38 || iKeyCode == 40 || iKeyCode == 13 || iKeyCode == 9) {
            return true;
        }
        else if((iKeyCode > 47) && (iKeyCode < 58)){
            return true;
        }
    }
    else
    {
    return false;
    }
}

In source referred js file as
<script language="javascript" type="text/javascript" src="../JS/Common.js"></script>
Code behind
FtxtDate.Attributes.Add("onkeydown", "return NumericText_KeyDown(event);");

But Validation for integer in textbox not working.