redirection help

Hi, Have been coding in asp for the past 18 months but have now decided to move our site to php and mysql. In asp we used a function response.redirect to send the user to another page as required, is there a similar function in php that can work from within side the page rather than the header area? We get Warning: Cannot add header information - headers already sent by (output started at D:\php-dev\includes\lg.php:2) in D:\php-dev\includes\lg.php on line 26 When using header("Location: Many thanks for any help. Zac