Change introduction to a variable with $ in front of it or put it in quotes
"introduction".

> What Can I do to stop the foreach function from working if 
> $menu is not
> set??
> 
> <?
> if ($menu==(introduction)) {$sub = array(
> 'overview.php' => 'Overview',
> 'moreinfo.php' => 'More Info'
> );
> }
 
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