serve long duration pages

This may be more appropriate for an Apache or browser forum. Perhaps you can suggest an appropriate one. I have a PHP script that takes a long time to complete (due to very heavy database activity) although it echoes unbuffered output every few seconds. I've set max_execution_time to 0 with set_time_limit(0) so PHP doesn't time out the page but after about 3 minutes, Firefox says, "The connection to the server was reset while the page was loading." and IE7 says, "Internet Explorer cannot display the web page". I want to try apache_reset_timeout() but it's not implemented in 4.3.10. Is there anything I can do from PHP or elsewhere to solve this? John Gunther Bucks vs Bytes Inc