Question Regarding Cookies, Sent Headers, and Functions That Return Values

Here's my question: I'm running code that essentially checks for either a certain IP address or a password before it sends a cookie. However, when I try to send the cookie, I get the standard "Error - headers already sent" when I haven't output anything. After some spot debugging, I found that if ( stristr($HTTP_SERVER_VARS["remote_address"],"XXX.YYY.ZZZ") ) { ... essentially counts as a sent header. I imagine this has to do with the fact that stristr returns a TRUE or FALSE value, but not being an expert in programming concepts, I wouldn't know. Anywho, if anyone knows a workaround for this or could explain the problem that lies within, it would be greatly appreciated. Thanks, Kyle Hale Computer Guy KANM Student Radio Texas A&M University