#custommask { 
position:absolute; 
top:0%; 
left:0%; 
width:100%; 
height:100%; 
background-color:black; 
z-index:1001; 
-moz-opacity:0.8; 
opacity:.80; 
filter:alpha(opacity=80); 
overflow:hidden;
} 
#custompopup{ 
position:absolute; 
top:25%; 
left:35%; 
z-index:1002; 
overflow:auto; 
}
.custompopup_div {
    width:340px;
    height:250px;
}
.customhidden {
    display:none; 
}