[jQuery] change css relative to css file

[bleen]

I have this:

$('#id').click( function(){ $(this).css('background-image','url(images/
img.jpg)'); } );

Problem is that I want to use a path (images/img.jpg) that is relative
to my CSS file, not to the current page...  The obvious first question
will be "why not just put /path/to/images?"  The answer is I'm trying
to incorporate something into a drupal module and so I cannot be
certain of what the full path will be.

Thoughts?

Alex