whats wrong with this php script?

Question

http://wayiran.persiangig.com/php.htm

I'm getting this error:
Warning: Cannot modify header information - headers already sent by (output started at C:\wamp\www\search.php:2) in C:\wamp\www\search.php on line 19

What should I do? can you correct my code?

yes I know, but I cant remove this function which tries to change header... It must be there... then what should I do?

Thanks Cypher Team, Its working now..

Answer 1

remove and tag from the first line
the first charecter will be
The main reson is before u calling header() function there must not be print anything on the page

try this program:
echo "hello cypher";
header("location:http://yahoo.com");
?>
this will be error

Answer 2

"headers" are sent BEFORE the page content.
You must have, somewhere in the "BODY", a function that attempts to change the headers.
This can even be a blank line!