Include a custom php file in mainpage.php

[BeautyHealth.com.cy]

now this is a whole new php file, all the coding is in that file, php file which echo html back.

you can see this in operation here : http://www.beautyhealth.com.cy/testgal8.php

Now i want to show that output on my main page through that php file....

How can i do that?

i have tried to add this code

<?php
include("testgal7.php");
?>

in my mainpage via the define pages admin but at soon as it reached that line the rest was blank....

PLEASE SOMEONE HELP