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sl6972,

// Simple code
session_start();

if (!isset($_SESSION['div'])) {
    $_SESSION['div'] = 1;
} else {
    $_SESSION['div']++;
}

if ($_SESSION['div'] == 1) {
    echo '<div id="id1">Division 1</div>';
} elseif ($_SESSION['div'] == 2) {
    echo '<div id="id2">Division 2</div>';
} elseif ($_SESSION['div'] == 3) {
    echo '<div id="id3">Division 3</div>';
} else {
    echo '<div id="id3">Division 4</div>';
    unset($_SESSION['div']);
}