use of header function

i want to delete data from database by clicking a link named "Delete".I want to do it,just by clicking not after refreshing the page. My table and another code including links one,is on a page named "editordeletedata" and the mysql query is on another page named "delete". For this i want to use header function in my delete page. But it shows:

Warning: Cannot modify header information - headers already sent by (output started at C:开发者_StackOverflow中文版\xampp\htdocs\www\php everyday site tutorials\delete.php:2) in C:\xampp\htdocs\www\php everyday site tutorials\delete.php on line 13

Please tell me the correct use of header function or any other way.

editordelete page: contain a link named "Delete"

delete page :

<p> <title>delete</title> </p>
<?php
    include "include.php";
?>

<?php

    if(isset($_GET['id']))
    {
        $order = "DELETE FROM employee WHERE id='$_GET[id]'";
        mysql_query($order) or die (mysql_error());
    }
    header("Location: editordeletedata.php");         

?>

something is being printed before header function call. If nothing apparently then it must be a space. delete all spaces being printed. convert it into hex format to check where are those spaces creating problem.