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Session and XHTML validation error


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I just made a style switcher for my site and now the page doesn't validate

The site is www.chrisgmyr.com go to the validation results.

here is style-switcher.php
$all_css = array();

$all_css['default']['file'] = "css/style.css"; // default
$all_css['red']['file'] = "css/red.css";
$all_css['blue']['file'] = "css/blue.css";
$all_css['green']['file'] = "css/green.css";

$all_css['default']['label'] = "Default"; // default
$all_css['red']['label'] = "Red";
$all_css['blue']['label'] = "Blue";
$all_css['green']['label'] = "Green";

$default_value = "default"; // set the default value here

if (isset($_GET['change_css']) && $_GET['change_css'] != "") {
    $_SESSION['css'] = $_GET['change_css'];
} else {
    $_SESSION['css'] = (!isset($_SESSION['css'])) ? $default_value : $_SESSION['css'];
switch ($_SESSION['css']) {
    case "red":
    $css_file = "css/red.css";
    case "blue":
    $css_file = "css/blue.css";
case "green":
    $css_file = "css/green.css";
    $css_file = "css/style.css";
function style_switcher() {
    global $all_css,$PHP_SELF;
$self = $PHP_SELF;
$stripslash = explode("/", $self);
$self = $stripslash[1];

    $style_links = "";
    foreach ($all_css as $key => $val) {
        if ($_SESSION['css'] != $key) {
            $style_links .= "<a href=\"$self?change_css=$key\">";
            $style_links .= "".$val['label']."</a>";
        } else {
            $style_links .= "<span class=\"current\">".$val['label']."</span>";
    return $style_links;

any ideas on what I can do to fix it?

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