#idAlert{
        display: none;
        position: fixed;
        background: rgba(0,0,0,.3); 
        top:0;
        left:0;
        bottom: 0;
        right: 0;
        width: 100%;
        height: 100%;
        z-index: 200;
        filter:progid:DXImageTransform.Microsoft.Gradient(GradientType=0,StartColorStr=#90696969,EndColorStr=#90696969);
}
#idAlert div{
        border: 5px single black;
        box-shadow: 5px 5px 3px #000000;
        padding: 5px;
        background: white;
        position: absolute;
        top: 0;
        bottom: 0;
        left: 0;
        right: 0;
        margin: auto;
        height: 90px;
        width: 500px;
        text-align: center;
        vertical-align: middle;
}