Hi, i would like to add an image that acts like a border after every list in the sidebar. I knew it has something to do with this

#sidebar h2 {
border-bottom: 1px solid #d6d6d6;
}

since i tried that code and a border appeared. But what i wanted is a picture, i could do that with in the posts with:

.TitleBorder {
background: url(images/border.png) repeat-x;
height: 3px;
width: 615px;
}

and 
<div class="TitleBorder"></div>

but in sidebar, i can't do that. Any help?