var ERROR_MESSAGES = new Array(
    'The data are incorrect, please check them.',
    'Please enter the name of the event.',
    'Please enter the number of people.',
    'Please enter the starting date of the event.',
    'Please insert the ending date of the event.',
    'Please enter the name of the contact person.',
    'Please enter the contact telephone.',
    'Please enter contact email.',
    'Invalid email.'
);

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