.podbox {
display: block;
position: absolute;
top:0px;
left: 0px;
width: 100%;
height: 100%;
background-color: black;
background-position: left top;
opacity:0.4;
filter:alpha(opacity=40);
z-index: 100;
}

.podbox_content {
background-image: url(/podbox/DevBioHelpScreen.png);
background-color:white;
background-position: center;
opacity:1;
width: 800px;
height: 595px;
position: absolute;
z-index: 100;
left: 50%;
margin-left: -400px;
top: 20px;
border: 1pt solid grey;
display: 
}

.podbox_content img {
opacity:1;
filter:alpha(opacity=100);
}