Maddog,
<body style="height:100%">
<style type="text/css">
#Pop {
position:fixed;
z-index:3000;
border:3px solid #AAE5FC;
top:50%;
left:50%;
width:300px;
height:170px;
margin-top:-85px; /*-(170/2)*/
margin-left:-150px; /*-(300/2)*/
border-radius:15px;
-webkit-border-radius:15px;
-khtml-border-radius:15px;
-moz-border-radius:15px;
-o-border-radius:15px;
-ms-border-radius:15px;
box-shadow: 0px 5px 18px #000;
-webkit-box-shadow:0px 5px 18px #000;
-khtml-box-shadow:0px 5px 18px #000;
-moz-box-shadow:0px 5px 18px #000;
-ms-box-shadow:0px 5px 18px #000;
}
</style>
<div id=Pop>
</div>