.tree{display:block;height:14px;width:14px;cursor:pointer}.tree.closed,.tree.closed:hover,.tree.opened,.tree.opened:hover{background-image:url(../img/tree.jpg);background-repeat:no-repeat;background-color:transparent}.tree.closed{background-position:0 0}.tree.closed:hover{background-position:0 -14px}.tree.opened{background-position:0 -28px}.tree.opened:hover{background-position:0 -42px}