background url

Hi All!
Got a little irritating problem going on, and would be grateful if someone could help me out!

I have created a style sheet and the way I link a particular php script to the CSS is by doing the following in the php script:

<style type="text/css" media="screen">
 
@import url("http://www.blahblahblah/styles/style.css");
 
</style>
 
<style type="text/css" media="screen">
 
.content {
 
background:url('../images/bg002.jpg');
}
 
</style> 

Now at the top of each php script, I have defined the page specific variables (e.g. define("BACK_IMAGE, "bg003.jpg") ).

What I want to do is change  background:url('../images/bg002.jpg'); and include these defined variables. I have tried a number of times and attempts include:

- background: url('images/<?php echo BACK_IMAGE;?>') no-repeat;

but they just don't seem to work :S

Can someone point me in the right direction? I'd be very grateful