function validate_delete_observation()
{
global $objObserver;
$util = new Utils();
$cometobservations = new CometObservations();
if (!$_GET['observationid']) {
unset($_SESSION['deepskylog_id']);
header("Location:../index.php");
} elseif ($_GET['observationid']) {
// only admins may delete a comet observation
$role = $objObserver->getObserverProperty($_SESSION['deepskylog_id'], 'role', 2);
if ($role == RoleAdmin || $role == RoleCometAdmin) {
$cometobservations->deleteObservation($_GET['observationid']);
$_GET['indexAction'] = 'comets_all_observations';
} else {
unset($_SESSION['deepskylog_id']);
header("Location: ../index.php");
// back to entrance page
}
}
}