Problem mit PHP/MySQL

[Underserial]

PHP-Code:

<?include("admin/config.inc.php");include("admin/var.inc.php");if(mysql_connect($sql_host, $sql_user, $sql_pass)){    mysql_select_db($sql_db);}else{    error("Keine DB Verbindung m&ouml;glich","Die Verbindung zur Datenbank konnte nicht hergestellt werden");}$sub=htmlspecialchars($_GET['sub']);$con=htmlspecialchars($_GET['con']);if($sub==""){    $sub=$startcat;    $con=$startpage;
}
if($con=="")
{
    $con=$startpage;
}


$res=mysql_query("SELECT * FROM content WHERE submenu = $sub ORDER by name");
while($arr=mysql_fetch_row($res))
{
    if ($con==$arr[0])
    {
        $submenu.= "<a class=\"left_mark\" href=\"index.php?con=".$arr[0]."&sub=".$arr[3]."\">".$arr[1]."</a>";    
    }else{
        $submenu.= "<a class=\"left\" href=\"index.php?con=".$arr[0]."&sub=".$arr[3]."\">".$arr[1]."</a>";        }    }$res=mysql_query("SELECT * FROM menu ORDER by name");while($arr=mysql_fetch_row($res)){    if ($arr[2]==0)    {        $idee=$arr[0];        $resulu=mysql_query("SELECT * FROM content WHERE id = $idee ORDER BY id LIMIT 1");        $cona=mysql_fetch_array($resulu);        $conit=$cona[0];    }else{        $conit=$arr[2];    }    if ($sub==$arr[0])    {        $menu.= "<a class=\"top_mark\" href=\"index.php?con=".$conit."&sub=".$arr[0]."\">".$arr[1]."</a>";        }else{        $menu.= "<a class=\"top\" href=\"index.php?con=".$conit."&sub=".$arr[0]."\">".$arr[1]."</a>";        }    }$res=mysql_query("SELECT * FROM box");while($arr=mysql_fetch_row($res)){    if($arr[3]==1)    {        $box_left.=file_get_contents("templates/box.tpl")."<br>";        $box_left=str_replace("{box_title}",$arr[1],$box_left);        $box_left=str_replace("{box_con}",$arr[2],$box_left);    }else{        $box_right.=file_get_contents("templates/box.tpl")."<br>";        $box_right=str_replace("{box_title}",$arr[1],$box_right);        $box_right=str_replace("{box_con}",$arr[2],$box_right);    }}$res=mysql_query("SELECT * FROM content WHERE id='$con'");$arr=mysql_fetch_array($res);$con_center=file_get_contents("templates/box.tpl");$con_center=str_replace("{box_title}",$arr[1],$con_center);$con_center=str_replace("{box_con}",$arr[2],$con_center);$con_info=file_get_contents("templates/box.tpl");
$con_info=str_replace("{box_title}",$info_name,$con_info);$con_info=str_replace("{box_con}",$info_con,$con_info);$con_menu=file_get_contents("templates/box.tpl");$con_menu=str_replace("{box_title}","Hauptmen&uuml;",$con_menu);$con_index=file_get_contents("templates/index.tpl");$con_index=str_replace("{menu}",$menu,$con_index);$con_index=str_replace("{center}",$con_center,$con_index);$con_index=str_replace("{box_right}",$box_right,$con_index);$con_index=str_replace("{box_left}",$box_left,$con_index);$con_index=str_replace("{leftmenu}",$con_menu,$con_index);$con_index=str_replace("{box_con}",$submenu,$con_index);$con_index=str_replace("{info}",$con_info,$con_index);echo $con_index;?>