header() error

[BIOSTALL]

Hey, i have had errors whilst using header() before and been able to solve them easily enough but now i've got one i just cant figure out.

I am using:

if (!$result) {
				echo "<div align='center'>Error editing post<br><br><a href='javascript:history.go(-1)'>Go Back</a></div>";
			}else{
				header("location:ForumReplies?threadid=".$threadid);
				exit();
			}

and getting the error:

Warning: Cannot modify header information - headers already sent by (output started at /home/virtual/site13/fst/var/www/html/ForumAddEdit.php:26) in /home/virtual/site13/fst/var/www/html/ForumAddEdit.php on line 55

Yet, line 26 is just html code for a table, nothing to do with headers. Anyway, i've made sure there is no white space or anything before or after the <?php and ?> but i just cant figure out why i'm getting the error :-S If anyones got any suggestions i'd be very grateful. cheers, BIOSTALL

btw, if you want me to post more code, just ask 🙂

[Installer]

You can't output anything; not white space, not a table, not anything that will go out as html.

[bradgrafelman]

Also take a look at RFC 2616 sec14.30 regarding the proper use of a Location redirect.