.darkClass
{
    background-color: #cccccc;
    filter:alpha(opacity=70); /* IE */
    opacity: 0.7; /* Safari, Opera */
    -moz-opacity:0.7; /* FireFox */
    text-align: center;	
	vertical-align:middle;
    position:absolute;
    top: 0px;
    left: 0px;
	width: 100%!important;
	height: 100%!important;
	display: none; 
}

.darkClassWithoutHeight
{
    background-color: #cccccc;
    filter:alpha(opacity=70); /* IE */
    opacity: 0.7; /* Safari, Opera */
    -moz-opacity:0.7; /* FireFox */
    text-align: center;	
	vertical-align:middle;
    position:absolute;
    top: 0px;
    left: 0px;
	width: 100%!important;
	display: none; 
}

.darkMiddleClass
{
	width: 500px;
	top:200px;
    background: white;
    display: none;
    position: absolute;
}

.darkMiddleClassFixed
{
	width: 600px;
	max-width: 800px;
	max-height: 600px;
	top:50px;
    background: white;
    display: none;
    position: absolute;
}