.mainbox{    overflow:hidden;    position:relative;}.flashbox{   overflow:hidden;    position:relative;}.imagebox{    text-align:right;position:relative;z-index:1;text-align:center;}.bitdiv{display:inline-block;width:18px;height:18px;margin:0 10px 10px 0px;cursor:pointer;}.defimg{background-image:url(images/a_2.png); background-repeat:no-repeat;}.curimg{background-image:url(images/a_1.png); background-repeat:no-repeat;}