function test(fieldId, msgId)
{
        if (document.getElementById( fieldId ).value == '')
        {
		document.getElementById( msgId ).innerHTML = 'missing'; 
		document.getElementById( msgId ).style.fontFamily = "Verdana";
		document.getElementById( msgId ).style.color = "red";
		document.getElementById( msgId ).style.fontSize = "10";
		return false;
        }

		document.getElementById( msgId ).innerHTML = '';
		return true;
}

function validateForm()
{
  return (test('FieldData0', 'FieldData0_info') &&
          test('FieldData1', 'FieldData1_info')  &&
          test('FieldData2', 'FieldData2_info')  &&
          test('FieldData4', 'FieldData4_info') );
}