Problems

[Marcin73]

$page = mysql_fetch_array(db_query("SELECT admin_name, admin_pass FROM ".$db_prefix."_seitenkonfig LIMIT 1"));

??

[SebbyPHM]

find

$page = mysql_fetch_array(db_query("SELECT admin_name, admin_pass FROM ".$db_prefix."_seitenkonfig LIMIT 1")); 

replace with

$sql = mysql_query("SELECT admin_name, admin_pass FROM ".$db_prefix."_seitenkonfig LIMIT 1") or die (mysql_error ());
$page = mysql_fetch_array($sql);