PHP forum

<?php if( !isset($_SESSION['user']) ){;?>Nelze založit téma<?php else:?><a href="nove_tema.php?parent=<?php echo $id; ?>" style="float:right; color: rgb(255, 255, 255);">Nový příspěvek</a> <?php };?></div>

<?php require('../dbconnect.php');
if(isset($_GET['parent'])){$id = intval($_GET['parent']);
if(isset($_SESSION['user'])){$dn1 = mysql_fetch_array(mysql_query('select count(c.id) as nb1, c.name from categories as c where c.id="'.$id.'"'));
if($dn1['nb1']>0){?>
<script src="//cdn.tinymce.com/4/tinymce.min.js"></script>
<script>tinymce.init({ selector:'textarea' });</script>
<style> 
input {width: 87%;padding: 12px 20px;margin: 8px 0;box-sizing: border-box;border: 3px solid #ccc;-webkit-transition: 0.5s;transition: 0.5s;outline: none;}
input:focus {border: 3px solid #555;}
</style>
  <div class="mainBody">
    <div class="container">
      <div class="row">
        <div class="col-md-8">
<?php
if(isset($_POST['message'], $_POST['title']) and $_POST['message']!='' and $_POST['title']!=''){$title = $_POST['title'];
$message = $_POST['message'];
if(get_magic_quotes_gpc()){$title = stripslashes($title);
$message = stripslashes($message);}
$title = mysql_real_escape_string($title);
$message = mysql_real_escape_string($message);
if(mysql_query('insert into topics (parent, id, id2, title, message, authorid, timestamp, timestamp2) select "'.$id.'", ifnull(max(id), 0)+1, "1", "'.$title.'", "'.$message.'", "'.$_SESSION['id'].'", "'.time().'", "'.time().'" from topics')){?>
<meta http-equiv='refresh' content='0;url=/forum/topics.php?parent=<?php echo $id; ?>'><?php }else{echo 'Vyskytla se chyba.';}}else{?>
<form action="nove_tema.php?parent=<?php echo $id; ?>" method="post">
    <input type="text" name="title" placeholder="Zadejte název témy" id="name" /><br />
    <textarea name="message" id="message" cols="70" rows="6" placeholder="Krátké informace o kategorii"></textarea><br />
    <input type="submit" value="Odeslat" />
</form>                                                               
<?php }}else{echo "<meta http-equiv='refresh' content='0;url=/forum'>";}}else{echo "<meta http-equiv='refresh' content='0;url=/forum'>";?>
<?php }}else{echo "<meta http-equiv='refresh' content='0;url=/forum'>";}?>
        </div>