function isEmpty(_field, error) {
  if ((_field.value == null) || (_field.value == "")) { 
    alert("Please enter " + error);
	_field.focus();
    return true;
  }
  return false;
}

function validEmail(_field) {
  if (_field.value.indexOf('@') == -1) {
    alert("Please enter a valid email address");
	_field.focus();
	return false;
  }
  return true;
}

function isSelected(_field, error) {
  if (_field.options[_field.selectedIndex].value == "") {
    alert("Please select " + error);
	_field.focus();
	return false;
  }
  return true;
}

function optionSelected(_field, error) {
  var valid = false;
	
  for (var x = 0;x < _field.length; x++) {
    valid = _field[x].checked
	if (valid) { break; }
  }
  if(!valid) {
	alert("Please select " + error);
	_field[0].focus();
	return false;	
  }  
  return true;
}

function isOptionOne(_field) {
  if(_field[0].checked) {
	return true;	
  }  
  return false;
}