php is a code, you have to do it like this, code ur layout, then seperate the code into different sections
example
split the code into 2, where do u split it?
good question your first part is going to be the part right up to where your content starts and the second part begins where the content ends and the second part ends until the rest of the code then name those two differnt section into differnt names such as above and below, then upload those files and in ur new page put
CODE
<?php include("above.php")?>
this is now ur header and then add
CODE
<?php include("below.php")?>
and in between this put the content for that specific page, iframes are html codes that connect another webpage to the one your on,
CODE
<iframe>content here</iframes>
but php would be better if you have more content
okay so if your completely lost just pm me or post ur code so I can split it for you, I hope this helped:]