[Opserty]

You don't need to write an else clause, if the conditional does not match then it simply won't execute the code between the braces.

PHP Code:

if(is_member_of($vbulletin->userinfo, 2, 4, 5))
{
    // Fetch our template
    // Display our template...
}
//If users are NOT in usergroup 2, 4, 5 then they get a blank page... 


I think maybe you are over complicating matters? It's not exactly clear what you are trying to achieve.