Showing different contents in one template

[fluidsharp]

Hi guys!

 

Could you give me advice about this issue:

index.php

<?php
$page = $_GET['page'];
if ($page == NULL)
    {
        $page =  "main";
    }  
  
?>
<div>Header</div>
<div>
<?php require("view/$page.php");?>
</div>
<div>Footer</div>

 

main.php

<?php
require "func.php";
?>
<form method="post" action="view/add.php">  
  <input type="text" name="from" value=""><br />
  <input type="submit" value="Add"> 
</form>    

 

add.php

<?php
require "../func.php";
$from = $_POST['from'];
$a = add($from);
echo $a;
?>

 

func.php

<?php
function add($a)
{
$c = $a+100;
return $c;
}
?>

I need output result (echo $a) in new windows (target= _blank) and output must be same like with main.php. In other words content of add.php output in index.php

This code is just simplified of real code.

 

Thank you in advice

[Lyleyboy]

Not sure what you are getting at.