How do I make "ground" (the footer) always on the bottom?

edit

Place this in the extra.css (found in askbot/media/style) as a quick, clean workaround to have a nice sticky footer:

html {
    position: relative;
    min-height: 100%;
}
body {
    margin: 0 0 100px; /* bottom = footer height */
}
#ground {
    position: absolute;
    left: 0;
    bottom: 0;
    height: 100px;
    width: 100%;
}