Removing special characters from the Textbox using JavaScript.

<script language="javascript" type="text/javascript">
        function RemoveSpecialChar(txtVal) 
        {
            if (txtVal.value != '' && txtVal.value.match(/^[\w ]+$/) == null) 
            {
                txtVal.value = txtVal.value.replace(/[\W]/g, '');
            }
        }
    </script>
<asp:TextBox ID="txtName" onkeyup="javascript:RemoveSpecialChar(this)" runat="server">