_Rusja_,
code (+/-)
if ($headmod != "mainpage" || ($headmod == 'mainpage' && $act)) {
echo '<div class="menu" style="text-align: center;"><a href="/">Главная</a>'
. '<img src="../images/ic.PNG" alt="gl" /><a href="' . $set['homeurl'] . '/forum/">Форум</a>'
. '<img src="../images/ic.PNG" alt="gl" /><a href="' . $set['homeurl'] . '/mchat/index.php">Чат</a>'
. '<img src="../images/ic.PNG" alt="gl" /> <a href="' . $set['homeurl'] . '/quiz/index.php">Вкторина</a>'
. '<img src="../images/ic.PNG" alt="gl" /> <a href="' . $set['homeurl'] . '/library/"> Библеотека</a>'
. '</div>';
}