Alexander,
Look in the HTML sub-section of the Articles section on phpbuilder. There's lots of good articles there on design. The easiest way is to create a header and footer file which contain your HTML template then include them.
Let's assume your basic layout uses a 9 celled table, where the main body of your page (the stuff that changes) is in the middle cell. The header file contains the table open tag and the first 4 cells and the <td> for the fifth. The footer file contains the fifth cells </td> and the rest of the table.
<?php
include("header.php");
// the code, text, etc. for the page goes here
include("footer.php");
?>
This will place all the stuff between the includes file in the middle cell. Very simple example, but you should be able to easily expand it to suit your purposes. Also makes it deuced easy to incorporate stuff like site wide stats tracking, hit counters, class libraries, etc. since you just include them in the header file and all your pages have access to them. HTH,
Cheers,
Geoff A. Virgo