Only One Forum, Make it the Default Homepage

[EricTheRed]

I only have one forum at the moment and want to make forumdisplay.php my homepage without doing any type of redirect but I keep getting "Invalid Forum specified. If you followed a valid link, please notify the administrator."

This is what I have done so far:

1) Created a new plugin in the Admin CP with a Hook Location of global_start and with PHP Plugin Code

PHP Code:

if(THIS_SCRIPT == 'forumdisplay'){
     $_REQUEST['f'] = 4; //4 is the forumid I want to use.
} 


2) Rename forumdisplay.php to index.php

I'm brand new to vB so I'm having trouble figuring how to manipulate the forumid variable that forum.php passes over in the URL to forumdisplay.php. If anyone can point me in the right direction I would be very thankful.