#cover {
display:none;
z-index:100;
_z-index:0;
position: absolute;
left:0px;
top:0px;
width:100%;
height:100%;
background: black;
filter:alpha(Opacity=70);
opacity:0.7;
-moz-opacity:0.7;
-khtml-opacity:0.7;
}

#dialog {
display: none;
z-index:200;
_z-index:1;
position: fixed;
_position: absolute;
top: 50%;
left: 50%;
margin-top: -200px; /*set to a negative number 1/2 of your height*/
margin-left: -350px; /*set to a negative number 1/2 of your width*/
_margin-left: -350px;
_margin-top: 50px;
_top: 50px;
width:700px;
height:400px;
background:white;
padding:2px;
font:10pt tahoma;
border:2px solid black;
overflow:  scroll;
}