.Dialog
{
    background-image:url('../images/dialog_bg.png'); 
    background-repeat:no-repeat;
	visibility: hidden;
	position: absolute;
	top: 65%;
	left: 55%;
	vertical-align: middle;
	margin: -250px 0px 0px -250px;
	width: 400px;
	height: 400px;
}
.DialogBackGround
{
    left: 0px;
    top: 0px;
    visibility: hidden;
    height: 100%;
    width: 100%;
    position:fixed;
    background-color: #ffffff;
    opacity: 0.8;
    filter: alpha(opacity = 80);
}