$mysql_username = "a4232831_manager";
$mysql_password = "passwoord1";
$mysql_host = "mysql3.000webhost.com";
$db = mysql_connect($mysql_host, $mysql_username, $mysql_password) or die("Kan niet verbinden: " .mysql_error());
mysql_select_db("kasboek", $db);
$sql = "SELECT * FROM users WHERE username = '$username' and password = '".md5($password)."'";
$result = mysql_query($sql) or die("werkt niet, foutmelding: " .mysql_error());
mysql_close($db);