validations in javascript

  ***********  Number & Character Validations******************
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<script language ="javascript " type ="text/javascript">
function isNumberKey(evt)
    {
       
         var charCode = (evt.which) ? evt.which : evt.keyCode
         if (charCode > 31 && (charCode < 48 || charCode > 57))
            return false;
     
    }
  function  isCharKey(evt)
{
var charCode=(evt.which)? evt.which : evt.keyCode;
if (charCode>=48 && charCode <=57)
return false;

}

   
</script>

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<asp:TextBox ID="TextBox2" runat="server"
    onkeypress="return isNumberKey(event);" MaxLength="10" ></asp:TextBox>


<asp:TextBox ID="TextBox2" runat="server"
    onkeypress="return isCharKey(event);" MaxLength="10" ></asp:TextBox>