.leftbg{width:500px;height:462px;position:absolute;top:0;background:#fff;left:50%;margin-left:-1190px;z-index:99;opacity: 0.5;filter: alpha(opacity=50);}
.rightbg{ width:500px; height:462px; position:absolute; top:0; background:#fff; right:50%; margin-right:-1190px; z-index:99;opacity: 0.5; filter: alpha(opacity=50);}