[merk]

You have to be careful redirecting visitors and not redirecting search engines, they really hate that.

As for the redirection, its pretty easy to create conditionals to achieve what you want

For example, if you wanted to redirect everyone except admins (use global_start)

PHP Code:

if(!is_member_of($vbulletin->userinfo, 6))
{
header("Location: http://www.coolsite.com/closed.html");
}