.overlay_dark{background:url(../images/dark.png) left top repeat;      bottom:0;      display:none;      height:100%;      left:0;      position:fixed;      right:0;      top:0;      width:100%;      z-index:20}
#loading{    background:url("../images/loading.gif") no-repeat scroll center center transparent;  bottom:0;  display:none;  height:100%;  left:0;  position:fixed;  right:0;  top:0;  width:100%}