#dialog_overlay{
    position:absolute;
    top:0;
    left:0;
    z-index:500;
    background: rgba(0, 0, 0, 0.6);
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=#C0000000, endColorstr=#C0000000);
    -ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr=#C0000000, endColorstr=#C0000000)";
    height:100%;
    width:100%;
    display:none;
}

.dialog{
    display:none;
    position:absolute;
    z-index:501;
}