PHP

<?php
$host="localhost"; // Host name
$username="mcbalkan_login"; // Mysql username
$password="*****"; // Mysql password
$db_name="mcbalkan_login"; // Database name
$tbl_name="karte"; // Table name

// Connect to server and select databse
$con=mysqli_connect("$host", "$username", "$password")or die("cannot connect");
mysqli_select_db("$db_name")or die("cannot select DB");
$unos_id=$_POST['tnumber'];
$unos_cijena=$_POST['cijena'];
$unos_film=$_POST['film'];
$unos_datum=$_POST['datum'];
$unos_vrijeme=$_POST['vrijeme'];
$unos_sjedalo=$_POST['sjedalo'];
$unos_ponistena=$_POST['chk_unos'];

//INSERT U BAZU
$sql="INSERT INTO karte (ID, Cijena, Film_ID, Datum, Vrijeme, Sjedalo, Ponistena);
VALUES
('$unos_id','$unos_cijena','$unos_film','$unos_datum','$unos_vrijeme','$unos_sjedalo','$unos_ponistena')";
mysqli_query($sql);
if (!mysqli_query($con,$sql))
  {
  die('Error: ' . mysqli_error($con));
  }
echo "1 record added";

mysqli_close($con);

?>
error:Warning: mysqli_select_db() expects exactly 2 parameters, 1 given in /home/mcbalkan/public_html/spacerik/kino/unos_insert.php on line 10
cannot select DB