body, html
{
    margin: 0;
    padding: 0;
}

.opaco
{
    width:100%;
    height:800px;
    text-align:center;
    position:absolute;
    margin:0 auto;
    background-color: #000000;
    filter: alpha(opacity=80); /* MSIE */
    opacity: 0.8; /* STANDARD */
    z-index: 1;
}

.adv1
{
    width:100%;
    height:100%;
    text-align:center;
    position:absolute;
    margin:0 auto;
    z-index: 1;
}

.adv2
{
    
    width:598px;
    height:314px;
    text-align: center;
    margin:158px auto;
    z-index: 1;
}

.no_opaco
{
}