/**spot layer **/
#SpotLayerBack { position:absolute;z-index:100;top:0;left:0;width:100%;height:100%;background-color:#000000;}
.alpha {-moz-opacity:0.5;filter:Alpha(opacity=50);}

/**spot layer **/
#SpotLayerCover { position:absolute;z-index:900;top:0;left:0;width:100%;height:100%;}