.main_menu {
  height:45px;
}
.main_menu {
  background-image:url(img/bgm_hwi.gif);
}
.menu_home {
 background-image:url(img/bgm_hwi_home.gif);
}
.menu_leist {
 background-image:url(img/bgm_hwi_leist.gif);
}
.menu_ref {
 background-image:url(img/bgm_hwi_ref.gif);
}
.menu_mit {
 background-image:url(img/bgm_hwi_mit.gif);
}
.menu_uns {
 background-image:url(img/bgm_hwi_uns.gif);
}
.menu_kont {
 background-image:url(img/bgm_hwi_kont.gif);
}
.start_bild_tag {
 background-image:url(img/bg_hwi_tag.jpg);
}
.start_bild_nacht {
 background-image:url(img/bg_hwi_nacht.jpg);
}