body{
 background: #41B0DC url(images/html-bg.gif) repeat-x scroll top;
}
.center_image { background: url(images/bgbody-1.jpg) no-repeat scroll center top; }

.lavaLampWithImage li.back {
    background: url("images/lava.png") no-repeat right -30px;
    width: 9px; height: 30px;
    z-index: 8;
    position: absolute;
}
.lavaLampWithImage li.back .left {
    background: url("images/lava.png") no-repeat top left;
    height: 30px;
    margin-right: 9px; /* 7px is the width of the rounded shape */
}