custom background for single post

Hi,

I have this plugin installed “Category Images” which basically helps me add an image for a category.

when i view my post, say for example from category “movies”. Can i put the category image has a background image for my single post?

this helps me get the link of the category image.(plugin)

<?php if (function_exists('z_taxonomy_image_url')) echo z_taxonomy_image_url(); ?>

i tried this code

<style type="text/css">
body.single{
background-image:url(<?php if (function_exists('z_taxonomy_image_url')) echo z_taxonomy_image_url(); ?>);
}
	</style>

thank you