Vraag MySQL door meerdere selectievakjes aan te vinken met automatische update

Probeer dit:

$('input[name=system]').click(function(){

    var ids = [];
    $('input[name=system]:checked').each(function() {
        ids.push($(this).attr('id'));
    });
    ids = ids.join(",");

    $.get("review.php", {param: ids}, 
        function(data) {
            $("div#update").html(data);
        }
    );
});

En in je PHP:

if (isset($_GET['param'])) {
    $param = "('" . str_replace(",", "','", $_GET['param']) . "')";
}
$qry = mysql_query("SELECT * FROM reviews WHERE os IN $param") or die(mysql_error());