[Boofo]

Here's a piece of code I use in my chat.php, it is will help you at all. It puts underscores for illegal characters.

PHP Code:

if ($bbuserinfo['userid']!=0) {
    $username1=ereg_replace("[^A-Za-z0-9_.@-]", "_", $bbuserinfo['username']);
    } 


The I have to use username1 in the variable. It should give you an idea of what to do.