div.BG_TopContainer
{
    position: absolute;
    top: 0px;
    left: 0px;
    width: 100%;
    height: 200px;
    background-color: #CCCCCC;
    z-index: 10;
}

div.BG_BottomContainer
{
    position: absolute;
    top: 0px;
    left: 0px;
    width: 100%;
    height: 100%;
    background-color: #F0F0F0;
    z-index: 0;
}