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?