#logo {position:absolute;top:0;left:0;z-index:11}
#ssBanner {position:relative;height:162px}
#ssBanner IMG {position:absolute;top:0;left:0;z-index:15;width:800px;height:162px} 
#ssBanner IMG.active {z-index:10}
#ssBanner IMG.last-active {z-index:9}