css div layout problem php include

Hello people

I'm having a problem with a layout.

I've got it working here
http://krayonrecordings.kaen.org/fivestoreyprojects/layout.html

but once I try to use the php inlucde function to add the content to the divs from separate pages the layout doesn't work.

http://krayonrecordings.kaen.org/fivestoreyprojects/layout.php

I'm on a tight deadline and this is my first time trying to do this, I can't see why it doesn't work, sorry if it's something real simple!

Please let me know if I need to provide any further information

div.left
{
float:left;
width:300px;
margin-left:95px;
margin-right:0px;
}
div.content
{
float:inherit;
margin-left:400px;
width:400px;
}

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