How do I include a php file in VB templates?

[evilc]

I have tried the instructions given here

So I created a plugin with global_start and added this

ob_start();
include('/random/RanCon.php');
$includedphp = ob_get_contents();
ob_end_clean();

And in the postbit legacy template I added

$includedphp


BUT , All i get is blank space where the output of the php file should be.

I think its the wrong path that I am using in the include statement.. can anyone tell me what the correct path should be?

Forum is at www.domain.com/forum
PHP file is at www.domain.com/forum/random/RanCon.php

Server path is /domain.com/public_html/forum/random

Help!