Can't figure out image directory resource for themes

[Calum]

Have read lots of articles previous answers, but can't get this to work the way it's supposed to.

I have a theme that looks likes this:

 <theme key="my-theme" name="My Theme" class="com.atlassian.confluence.themes.BasicTheme"> 
    <description>My theme description</description> 
    <param name="includeClassicStyles" value="false"/> 
    <resource type="download" name="default-theme.css" location="/includes/css/default-theme.css"> 
        <param name="source" value="webContext"/> </resource> 
    <resource type="download" name="css/my-theme.css" location="css/my-theme.css"/>
    <space-ia value="true"/> 
</theme>

So far so good, that works as expected. Now I want to add a resource for my images directory, which lives at the same level as my css directory. Everything I've read says I should then be able to reference the images as:

background-image: url(images/whatever.png)

However, I've tried including my resource between the <theme> tags:

 <resource type="download" name="images/" location="/images"/>

but that doesn't work (why not?).  Using url(images/whatever.png) just gives a 404.

If I put the resource outside the <theme> tags, at the top level of the XML file, it sort of works, in that I then have to reference the images as:

background-image: url(../images/whatever.png)

otherwise it tries to find the images in the (non-existent) images sub-directory of the css directory—why is it looking there?

Any ideas why this isn't working like everything else says it's supposed to?