blobon on "Change Background Image per page in atahualpa theme"

Hi
I´m using Atahualpla theme
I need to change the background image according to the page in you are.
I tried with the followin code at the end of the css.php file

<?php if (is_page('4') ): ?>
	   <style type="text/css">
	   body {background-image:url(images/bg-page4.jpg);}
	   </style>

and i only receive this legend:

Parse error: parse error in C:\wamp\www\wp\wp-content\themes\atahualpa\css.php on line 3146

Any idea about the code, of their ubication in the php file?
Thanks a lot.

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