Convert to PHP5.3

[vmen]

Can someone convert this to php5.3
admin.php

<?php
session_start();
if(!session_is_registered('myPass')) {

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

?>

check.php

<?php
$myUsername=$_POST['myUsername'];
$myPass=$_POST['myPass'];

if ($myUsername==("Admin") & $myPass==("Pass") ) {

	session_register('myUsername');
	session_register('myPass');
	header("location:admin.php");

}
else echo 'Something went wrong';

?>