function parseTuitContents()
{
$cont = split('[[:space:]]*;[[:space:]]*', $this->tuitContents);
$this->tuits_cnt = 0;
while (list($k, $v) = each($cont)) {
$v = str_replace(' ', '', $v);
list($t, $i) = explode(':', $v);
$this->tuits[$this->tuits_cnt] = array('type' => $t, 'id' => $i);
if ($t == 'e') {
$this->tuits[$this->tuits_cnt]['instance'] = ex_inst($i);
} elseif ($t == 'u') {
$this->tuits[$this->tuits_cnt]['instance'] = new UNIT($i);
}
$this->tuits_cnt++;
}
}
while (list($k, $v) = each($expls)) {
$nav_expl->add_item($v['ex_name'], "?section=exercise_display&exercise={$v['ex_id']}");
}
//$cont = "<h4>".$ex->parameters['ex_name']."</h4>";
if ($nav_expl->how_many()) {
if ($ex->parameters['ex_type'] == EXPLANATION) {
$cont .= "Exercises: ";
} else {
$cont .= "Explanations: ";
}
$cont .= $nav_expl->prepare();
}
return $cont;
}
if (is_numeric($exercise)) {
$ex = ex_inst($exercise);
$ex->get_parameters();
$expls = $ex->get_explanations();
$page->set_top($ex->parameters['ex_name']);
if ($show_more) {
$nav_expl = new VMENU();
$cont = show_expls($nav_expl, $expls, $ex);
$page->add_to_middle($cont);
} else {
$ex->get_data();
if (isset($submit_exercise) and is_array($answers)) {
ksort($answers);
$ex->set_answers($answers);
}
if ($submit_exercise) {
$cont .= "<h3>Your answers</h3>";
