Header location messing up

[TrainReq]

I am trying to do a header location.. but it is messing up .. it is giving me the following error


Cannot modify header information - headers already sent by (output started at /home/content/i/n/n/****/html/***/connect2.php:19)


I am using the following code

if($_SERVER['HTTP_REFERER'] =="http://profileawareness.com/forums"){

}else{
header("location: http://profileawareness.com/denied.html");
}

And it is giving an error in an included file (connect2.php), which all that has is some simple mysql querys (only 7 lines of code)

[_Aerospace_Eng_]

Nothing can be outputted to the browser before a header is used unless you have output buffering turned on which probably isn't the best solution. Post the code for connect2.php leaving out your passwords and user names.