.psection {        
    position:relative;
    z-index:5;
    display:inline-block;
    height:315px;
    width:100%;
    background-attachment:fixed;    /* this keeps the background in place */
    background-size: 100% auto; /*modificato davide */
    background-repeat:no-repeat;
    background-color:white;
    background-position: center center; /* AB per campigliodolomiti */
}
.pcontent {
    position:relative;
    z-index:2;
    background-color:#fff;
    border:2px solid #666;    
    height:50%;    /* this height difference allows the bg to show through */    
}
#s1 {
    background-image: url(segnaposto_parallax_1.jpg);   
}