Setting a PHP file as a background in external CSS

[calrockx]

I've got a DIV and I want it's background to be variable based on what's clicked on the site.

 

 

 

I've got a CSS file that's saved as PHP so I can run some PHP in it.

 

I have this function at the top:

 

<?php
function big_pic_image () {

	if(!$_GET[image]) {
			echo '/sections/_other/image.php/?width=600&height=450&&image=/sections/'.$_GET[section].'/_cover/cover.jpg'; } 
		else {
			echo '/sections/_other/image.php/?width=600&height=450&&image=/sections/'.$_GET[section].'/'.$_GET[category].'/'.$_GET[image].''; } 
		}

?>

 

And then lower down in the CSS, I have this

 

#big_pic {
float: left;
width: 600px;
height: 450px;
margin: 0 10px 10px 0;
text-align: center;
vertical-align: middle;
background: url('<?php big_pic_image(); ?>') center center;}

 

Everything seems to be working except for the variables being passed to the CSS background property.  The way those are set are based on the links througout the site.  So it seems the PHP in the CSS file isn't "seeing" the $_GET variables in the URL that are set based on image links in the site.

 

How can I make it so that those variables are set in this CSS?

[calrockx]

-OR-

 

instead of putting a function in the background property, is there a way I can set the background to a php file, and have all the necessary code for this to work just in that?