Help! why cant i connect to mysql?

<?php

define('DB_NAME','form');
define('DB_USER','root');
define('DB_PASSWORD', '');
define('DB_HOST', 'localhost');

$link = mysql_connect(DB_HOST, DB_USER, DB_PASSWORD);

  if(!$link){
  die('Could not connect: ' . mysql_error());
  }

  $db_selected = mysql_select_db(DB_NAME, $link);

  if(!$db_selected){
     die('Can\'t use'. DB_NAME .': ' .msql_error());
  }
  echo 'Connected successfuly';

  mysql.close();
?>