[PHP-WIN] Forward Link

[Wayne Hinch]

Hi all,
 
How can I get a page to automatically forward to the next page currently
I am trying to use 
 
header("Location: [filename.php]");
 
although this is not working it is bringing up the following error
 
Warning: Cannot add header information - headers already sent by (output
started at c:\html/customer/newcust.php:3) in [filename] on line 304
 
How do I get around this problem, Please help.
 
Wayne