note 13161 rejected from function.header by jimw

I'm trying to use something like what I have below, without any luck. Basically I am checking for some session information to be intact, and if not, I'd like to redirect to the begining page "/index.php" of the site they requested initially. I have "a.company.com" and "b.company.com" which might and should have different entries, databases to auth against, etc. However my header ("Location..") won't take any kind of variable statement, can someone offer a suggestion? Thanks John $ref_array = explode("/",$HTTP_REFERER); $site = $ref_array[2]; header ("Location: http://".$site."/");