.rbroundbox { background:url(roundedimg/nt.gif) repeat; }
.rbtop div { background:url(roundedimg/tl.gif) no-repeat top left; }
.rbtop { background:url(roundedimg/tr.gif) no-repeat top right; }
.rbbot div { background:url(roundedimg/bl.gif) no-repeat bottom left; }
.rbbot { background:url(roundedimg/br.gif) no-repeat bottom right; }

/* height and width stuff, width not really nessisary. */
.rbtop div, .rbtop, .rbbot div, .rbbot {
width: 100%;
height: 7px;
font-size: 1px;
}
.rbcontent { margin: 0 7px; }
.rbroundbox { width: 50%; margin: 1em auto; }