#btn {
height:17px;
width:31px
}

.bbtn {
background: url(/img/common/bbtngs.jpg) no-repeat;
float: left;
height:17px;
width:31px
}

.bbtn:hover {
background: url(/img/common/bbtn.jpg) no-repeat
}

.tbtn {
background: url(/img/common/tbtngs.jpg) no-repeat;
float: left;
height:17px;
width:31px
}

.tbtn:hover {
background: url(/img/common/tbtn.jpg) no-repeat
}