html, body {height:100%;}
body {margin: 0px 0px 0px 0px;}
div#container {
    position:absolute;
    height:87vh;width:100%;
    background: white;
    }
#header3vh {  /* contiene icone menu, e tasti di scelta */
    position:relative;
    height: 6vh;
    width:100%;
    font-family : verdana;
    overflow:hidden;
    border-top: 2px solid #999999;
    z-index:1;
    background: -moz-linear-gradient(top, #3399ff, #3366cc);
    }
table.menuvh   {
        margin-top: auto;
        margin-left:0px; 
        border-collapse: collapse; /* Elimina lo spazio fra le celle della tabella. */
        width:100%;
        table-layout:fixed; 
        overflow:hidden;
        white-space:nowrap;
        font-family : verdana;
        z-index:1;
        }
table.menuvh tr  {
        height: 6vh;
        font-size:10px;
        }
table.menuvh td.cc {
        text-align:center;
        border-left: inset 1px grey;
        border-right: inset 1px grey;
        }
table.menuvh td.sx {
        text-align:left;
        }
table.menuvh td.dx {
        text-align:right;
        }
table.menuvh td.fine {
        border-left:1px solid grey;
        text-align:center;
        }
.immagine1 {display: block;width:5.5vw;height:auto;border-right: inset 1px grey;}
.immagine2 {display: none;}
#cambio:hover .immagine1 {display: none;}
#cambio:hover .immagine2 {display: block;width:5.5vw;height:auto;border-right: inset 1px grey;}