body {
    position:relative;
}
.canvas {
    position:absolute;
    top:30px;
    left:50%;
    width:550px;
    height:300px;
    padding:10px;
    background:#FFF url("../images/loading.gif") 50% no-repeat;
    border:5px solid #CCC;
    z-index:10;
}

.mask {
    position:absolute;
    top:0px;
    left:0px;
    width:100%;
    height:100%;
    background:#FFF;
    z-index:10;
    -moz-opacity:0.8;
    filter:alpha(Opacity=80);
}

.btnClose {
    position:absolute;
    padding:3px;
    background:#CCC;
    color:#FFF;
    font-family:arial;
    font-size:12px;
    text-decoration:none;
    top:-25px;
    right:-5px !important;
}