Where has the categories header gone?!?

I have added this to css, and it shows...nothing! I had a background image there before, took it away, and added a new one later but it isn't coming up. The image name is right. Am I forgetting something?

website in progress here.

CSS controlling it is:

#categoriesHeading {
background-image: url(../images/categoryheader.jpg);
background-repeat: no-repeat;
line-height: 4em;
}

#categoriesContent {
line-height: 1.5em;
background-color: #ffffff;
padding-left: 3.5em;
}

Looks right to me?:huh:

Via admin, have you set you require category header tabs to show?

I have looked through the configuration links and can't find what you are referring to...?

via admin, configuration, layout settings, categories-tabs menu/on or off

Thats for the top menu isn't it? I am trying to get the categories header to show - the sidebox categories header, not the cattabs menu.

I have found this in the includes/modules/categories.php file. Is this making the background image not show??? So perplexed!

$title = BOX_HEADING_CATEGORIES;
$title_link = false;

If thats stopping the background image from showing in the sidebox header, how can I get the image to show? (It doesn't have to be a background image)

hmm any suggestions???