Cookies and Webform

[lintz]

I have a login area on my site and what I want is when a user returns to display their "username" in the login form.

This is my code but it's not picking up the "username" within the saved cookie. (and yes, the cookie exists!)

//get username from cookie
function cookie_username() {

$username = $_COOKIE['cookie_name'];
echo "$username";

}


//Then is form
<input type="text" name="username" size="10" maxlength="10" style="font-size: 8pt" value="<?php cookie_username() ?>">