[Admin]

First of all let me just tell you I love the idea, never seen it before but it's a great one.

Now, you can take advantage of an "unknown feature" so to speak, that lets you link to this, for example:
https://vborg.vbsupport.ru/index.php?s=&forumid=3
And voila, you get the sub forums of forum 3 showing up in the index file.

Of course for your forum it won't work now because you removed the template stuff. So, I'd make an if-else in index.php that basically does:

PHP Code:

if (isset($forumid)) {
  // do the regular index.php stuff, display forums and such
} else {
  // only show the 4 main links to the forums
}