a.button{ display: block; float: left; height: 34px; }

a#button_home{ width: 127px; background: url(img/rollover_menu/home.gif) 0 0 no-repeat; }
a#button_home:hover{ background-position: 0 -34px; }

a#button_oferta{ width: 75px; background: url(img/rollover_menu/oferta.gif) 0 0 no-repeat; }
a#button_oferta:hover{ background-position: 0 -34px; }

a#button_realizacje{ width: 98px; background: url(img/rollover_menu/realizacje.gif) 0 0 no-repeat; }
a#button_realizacje:hover{ background-position: 0 -34px; }

a#button_kontakt{ width: 85px; background: url(img/rollover_menu/kontakt.gif) 0 0 no-repeat; }
a#button_kontakt:hover{ background-position: 0 -34px; }

a#button_opinie{ width: 73px; background: url(img/rollover_menu/opinie.gif) 0 0 no-repeat; }
a#button_opinie:hover{ background-position: 0 -34px; }

a#button_home_active{ width: 127px; background: url(img/rollover_menu/home_a.gif) 0 0 no-repeat; }
a#button_oferta_active{ width: 75px; background: url(img/rollover_menu/oferta_a.gif) 0 0 no-repeat; }
a#button_realizacje_active{ width: 98px; background: url(img/rollover_menu/realizacje_a.gif) 0 0 no-repeat; }
a#button_kontakt_active{ width: 85px; background: url(img/rollover_menu/kontakt_a.gif) 0 0 no-repeat; }
a#button_opinie_active{ width: 73px; background: url(img/rollover_menu/opinie_a.gif) 0 0 no-repeat; }