#loading {background: url(spinner.gif) no-repeat center center #fff; border:1px solid #888; width:50px; height:50px; position:absolute; top:50%; left:50%; z-index:100; margin:-25px 0 0 -25px; display:none;}
#popup {background-color:#fff; border:1px solid #888; padding:10px; display:none; position:absolute; top:50%; left:50%; z-index:100;}
#overlay {background-color:#000; position:absolute; top:0; left:0; z-index:50; display:none; overflow:hidden;}