.expand{
    
    margin-left:0px;
    margin-top:3px;
    margin-right:10px;
    display:block;
    float:right;
    width:10px;
    height:10px;

    background-image: url(../../images/button/dir_right10.jpg);
}

.retract{
    background-image: url(../../images/button/dir_down10.jpg);
}