changing multiple elements' style independently via php

Now I got it. Thanks for sharing and advices Bebel

wizylabs said
Hi,

Place <?php session_start() ?> at the top of functions.php file then in your header.php use the code below

<?php

$_SESSION['color'] = 'blue';
if(isset($_GET['color']))
    $_SESSION['color'] = $_GET['color'];

?>

<link href="<?php bloginfo('template_directory'); ?>/css/<?php echo $_SESSION['color']; ?>.css" rel="stylesheet" type="text/css" media="all" />

Hi I know this is an old post, but I would like to know how you outputed this session for the colors?