Site/Forum Intergration Quick Question

[10sion]

Alright, my site is on www.endless-anime.com and my forums is ea-forums.net im trying to intergrate them togehter, theyre both on the same server, and are connected to the same database. The problem is login. You cant set a cookie over domains so what im trying to do is forward back and forth to get the cookie set on both places, so you login on the site, it sets the cookie/session there, forwards to the forums sets the cookie/session there and back to the site displaying a good login message, visa versa.

My trouble is that Im not the best at vbulletin, what im planning on doing is making a "raw" file on vbulletin names something like dologin.php, and it checks if your already logged in there, if you are your forwarded back to the site, othersize your sent through the login process, the variables that dologin.php on the vbulletin domain has already, sent through the forwarding is, userid, the password already salted, and rememberme... so can anyone give me a few hints on what to do (all that file needs to do is do the standard checks, then if the userid and pass is right set cookie/session then forward to good login on the site, else forward to bad login on the site...)

I took a look at the login once again, and came up with this being dologin.php (of course minus the standard security, I just want this to work before I make it secure)

<?php
// required files
require_once('./global.php');
require_once('./includes/functions_login.php');

if (!verify_authentication($username, $password, $md5password, $md5password_utf, true))
header("Location: http://www.endless-anime.com/?id=members/login&do=badlogin");
}
else {
header("Location: http://www.endless-anime.com/?id=members/login&do=goodlogin");
}
?>

if (!verify_authentication($username, $password, $md5password, $md5password_utf, true))

has me stumped, I am pretty sure that will set the cookie... or the session, whichever is used. I need to change it to the gets,

if (!verify_authentication($_GET[username], $_GET[password]?, $md5password, $md5password_utf, true))

Now this is where it gets tricky, since I only have $_GET[userid]/$_GET[username], and $_GET[saltedpass] to work with, I dont know what to do for password, md5password, and I dont even know what the md5password_utf, and true means... any ideas?