function ClearText(thefield) {
    if (thefield.defaultValue == thefield.value)
        thefield.value = "";
}
        function isNumberKey(evt)
        {
             var charCode = (evt.which) ? evt.which : event.keyCode
             if (charCode > 31 && (charCode < 48 || charCode > 57))
                return false;

             return true;
        }