.abgerundet {
    -moz-border-radius:15px;        /* Firefox */
    -webkit-border-radius:15px;     /* Safari, Chrome */
    -khtml-border-radius:15px;      /* Konqueror */
    border-radius:15px;             /* CSS3 */
    }

    .opaque {
    opacity:0.5;
    filter: alpha(opacity=50);
    -moz-opacity:0.5;
    width:250px;
    }