The HTML code of the site being sent to the user (you can not use less-than or greater-than signs in CSS files).
Somehow you need to set the margin and padding properties of the body tag to zero. Whether that entails editing the PHP or HTML, I don't know, that depends on if the PHP is writing the body tag or if there's HTML somewhere.
What is the code listed in the OP? It is PHP of some sort, but it looks like it's in the middle of the page somewhere. Where are the HTML and body tags written out?
Upon further examination, the problem actually lies somewhere within the CSS code. I can view the site without the CSS and I have no scrollbar problem.
BODY {
font-family: verdana;
}
When the font-family element (above) from the CSS is removed, it works fine. So, I believe the problem stems from different font sizes in your page.