a.smenu1 {
     display: block;
     width: 180px;
     height: 31px;
     background: url(mmenu-5_01.gif) no-repeat 0 -31px;
}

a.smenu2 {
     display: block;
     width: 310px;
     height: 31px;
     background: url(mmenu-5_02.gif) no-repeat 0 0;
}

a.smenu2:hover {
     background: url(mmenu-5_02.gif) no-repeat 0 -31px;
}