[fireknight]

Chances are is you will still have some undefined <table> or <td> or something.

At the top of your code you have a undefined table in the marque section.

    $news = $db->sql_query("SELECT id, name, added, post_img 
                            FROM ".$db_prefix."_torrents 
                            WHERE banned = 'no' 
                            AND visible='yes' 
                            ORDER BY ".$db_prefix."_torrents.id DESC LIMIT 5")or sqlerr(__FILE__, __LINE__);

    if ($db->sql_numrows($news) > 0) 
    {

        print("<marquee scrollamount=\"1\" onmouseover=\"this.scrollAmount=0\" onmouseout=\"this.scrollAmount=1\" scrolldelay=\"0\" direction=\"right\">
        <table align=center cellpadding=0 cellspacing=0 width=100% border=0>\n<tr>\n");

        while ($row2 = $db->sql_fetchrow($news)) 
        {

You also have an open table function

OpenTable("Τελευταίες Προσθήκες:");

Without seeing the function I cannot see how it is defined.
You can see by the example I posted in the previous page.
Of what to look for and how to correct the problem