I included some pages in my XOOPS website. But the title not changes so the bots can not spider my website. What can i do to change this?

I made my pages just as this :

<?php
include("/home/httpd/vhosts/mysite.com/httpdocs/mainfile.php");
include(XOOPS_ROOT_PATH."/header.php");
?>

my content here

<?php
include(XOOPS_ROOT_PATH."/footer.php");
?>

But it gives the same title, that i defined in Admin panel, to my all pages. What is the solution please?

This is a FAQ.

After include(XOOPS_ROOT_PATH."/header.php") you can change the title with:

$xoopsTpl->assign('xoops_pagetitle', 'Your Page Title');