err. of course, that's because I was in a hurry and when I removed your print I didn't update that. {$myusername} is in HTML now; you'd need to replace that with:
PHP Code:
<?php echo $myusername; ?>
your login is showing you as not logged on because you're using cookies. the cookie is being set, however a cookie doesn't actually become usable until you've loaded a new page. this can be gotten around by you having a redirect (to the "members" page) after the cookies are set (using the header() function). if you were to use sessions (as I recommended previously), this wouldn't be an issue.