var ERROR_MESSAGES = new Array(
    'The data are incorrect, please check them.',
    'Please enter your DNI(National Identity Number).',
    'Please enter your email address.',
    'Invalid email.',
    'Please enter your name.',
    'Please enter your surnames.',
    'Please enter the year of academic training.',
    'Please enter the date of birth.',
    'Please enter the number of children.',
    'The number of children is an incorrect value'
);

function getErrorMessage(code)
{
  if(code>ERROR_MESSAGES.length-1) code = 0;
  return ERROR_MESSAGES[code];
}