empty lines cause http headers?

I'm writing a page that will do a little snooping into a db (based on a previous form submit) and start a session based on the results. The problem is that PHP seems to be sending the HTTP headers when it encounters the first blank line in the code (which I do use to help separate the code a bit). Am I right in this assumption .. and then the big Q.. how do I do PHP calculations and then specify a session without sending premature headers by accident? ~ Mike -- Mike Zornek | Project Leader Apple Student Developers The Insanely Great Site with the Insanely Long URL http://www.applestudentdevelopers.org Personal Site: http://www.mikezornek.com