Error on Construct_navbits ($navbits); in a test mod

[Vaupell]

Trying out that mod How to create your own vbulletin powerd....

first i coudnt get global to connect until i entered Full http path. then it worked.

now im getting error on navbits..

$navbits = array(); 
$navbits[$parent] = 'test'; 

$navbits = construct_navbits($navbits); 
eval('$navbar = "' . fetch_template('navbar') . '";'); 
eval('print_output("' . fetch_template('test') . '");');

and yes i named the template 'test'
for the test purpose..
then i thought proberly some directory issue.

but i got test.php in both forums/test.php and in folder under forum
same error every time..

Fatal error: Call to undefined function construct_navbits() in URL on line 42


and line 42 is the $navbits = construct_navbits($navbits);

Suggestions ?