MySQL Problem

Lepo sam napravio ovo i na free hostingu (000host) radi a na Premium Hostingu (PAY) neradi,kaže function.session-start neznam,verovatno jer je na ovom pay novja verzja SQLa. . .

Kako da napravim da mi radi?

<?php

session_start();

$host="localhost"; // Host name 

$username="deltamar_web"; // Mysql username 

$password="deniel59"; // Mysql password 

$db_name="deltamar_web"; // Database name 

$tbl_name="members"; // Table name

// Connect to server and select databse.

mysql_connect("$host", "$username", "$password")or die("cannot connect"); 

mysql_select_db("$db_name")or die("cannot select DB");

// username and password sent from form 

$myusername=$_POST['myusername']; 

$mypassword=$_POST['mypassword'];

// To protect MySQL injection (more detail about MySQL injection)

$myusername = stripslashes($myusername);

$mypassword = stripslashes($mypassword);

$myusername = mysql_real_escape_string($myusername);

$mypassword = mysql_real_escape_string($mypassword);

$sql="SELECT * FROM $tbl_name WHERE username='$myusername' and password='$mypassword'";

$result=mysql_query($sql);

// Mysql_num_row is counting table row

$count=mysql_num_rows($result);

// If result matched $myusername and $mypassword, table row must be 1 row

if($count==1){

// Register $myusername, $mypassword and redirect to file "login_success.php"

session_register("myusername");

session_register("mypassword"); 

header("location:login_success.php");

}

else {

echo "Wrong Username or Password";

}

?>