/* simple greybox css style
*/
#gbx_overlay {
    width:100%;
    height:100%;
    position:fixed;
    left:0;
    top:0;
    margin:0;
    z-index:2999;
    display:none;
    background:#000; 
    opacity:.50;
    filter: alpha(opacity=50); 
    -moz-opacity: 0.5;
}