Fatal error: Call to undefined function mysql_connect()

Fatal error: Call to undefined function mysql_connect() in /var/www/admin/spravca.php on line 53

<?php if(!$ok) header("location: index.php");

$db_server = "sql3.endora.cz";
$db_meno = "gamelast";
$db_heslo = "******";
$db_db = "hosted";

define("ipcka", "93.185.105.253");
define("verzija", "1.7.2 Beta");

function kontrola()
{
   if(isset($_SESSION["end"]) && $_SESSION["end"] < date("m-d-Y"))
   {
      $port = $_SESSION["port"];
      mysql_query("UPDATE games SET `lock` = '4' WHERE port = '$port'");

      if($runserver) {
         $automat = "./svrs/".$_SESSION["port"]."/automat.wtf";
         unlink($automat);
         exec("pkill samp03svr".$_SESSION["port"]);
         }

      session_Destroy();
      header("location: index.php");
   }
}

function acess($co)
{
   $kdy = date("m-d-Y H:i", Time());
   $kdo = $_SESSION["id"];
   $ip = $_SERVER["REMOTE_ADDR"];
   mysql_query("INSERT INTO acess (`kdo`,`co`,`ip`,`datum`) VALUES ('$kdo', '$co', '$ip', '$kdy')") or die (mysql_error());
}

function ban()
{
   $port = $_SESSION["port"];
   mysql_query("UPDATE games SET `lock` = '3' WHERE port = '$port'");
   session_Destroy();
   header("location: #");
}

function mysql_con()
{
$db_server = "sql3.endora.cz";
$db_meno = "gamelast";
$db_heslo = "******";
$db_db = "hosted";


   $spojenie = mysql_connect($db_server, $db_meno, $db_heslo);
   mysql_select_db($db_db, $spojenie);
   mysql_query("SET NAMES `utf8`", $spojenie);
}

function Error($sp, $co, $ref, $rtn)
{
   printf('<br /><div class="'.$co.'">'.$sp.'</div>');

   if($rtn)
   {
      printf('</div></body>');
      printf('</html>');
   }
   printf('<br />');
   if($ref) header("refresh: 2");
}

function iso2no($text)
{
   $rtn = Str_Replace(
                        Array("á","č","ď","é","ě","í","ľ","ň","ó","ř","š","ť","ú","ů","ý ","ž","Á","Č","Ď","É","Ě","Í","Ľ","Ň","Ó","Ř","Š","Ť","Ú","Ů","Ý","Ž") ,
                        Array("a","c","d","e","e","i","l","n","o","r","s","t","u","u","y ","z","A","C","D","E","E","I","L","N","O","R","S","T","U","U","Y","Z") ,
                        $text);
   return $rtn;
}

function Bezp($kod)
{
   return mysql_real_escape_string(HTMLSpecialChars(iso2no($kod)));
}

function GetFileSize($size)
{
   if (!is_numeric($size)) return false;
   else{
      if ($size >= 1073741824) {$size = round($size/1073741824*100)/100 ." GB";}
      elseif ($size >= 1048576) {$size = round($size/1048576*100)/100 ." MB";}
      elseif ($size >= 1024) {$size = round($size/1024*100)/100 ." KB";}
      else {$size = $size . " B";}
      return $size;
   }
}

/*

kontrola();    // skontroluje ci neni server prosli, ak je tak ho lockne(4)
acess($kdo);   // zapise do access logu
ban();      // zabanuje uzivatela za pokus o hacking
mysql_con();   // pripoji sa k DB
ip();         // vypise IP servera
Error($sp);      // Vypise spravu
iso2no();      // Odstrani diakritiku
Bezp($kod);      // Zabezpeci text proti mysql znakom a htmpspecialchars znakom
GetFileSize($size)// Premeni velkost suboru


*/



?>

<?php phpinfo(); ?>