a img { width: 97px; border-width: 0; background: top left no-repeat;}

a#hme img {background-image: url(../Images/Navigation/Rollovers_Navmain/nav_but_home.jpg);}
a#str img {background-image: url(../Images/Navigation/Rollovers_Navmain/nav_but_start.jpg);}
a#anc img {background-image: url(../Images/Navigation/Rollovers_Navmain/nav_but_research.jpg);}
a#map img {background-image: url(../Images/Navigation/Rollovers_Navmain/nav_but_map.jpg);}
a#tch img {background-image: url(../Images/Navigation/Rollovers_Navmain/nav_but_teachers.jpg);}
a#crd img {background-image: url(../Images/Navigation/Rollovers_Navmain/nav_but_credits.jpg);}


a#hme:visited img {background-image: url(../Images/Navigation/Rollovers_Navmain/nav_but_home.jpg);}
a#str:visited img {background-image: url(../Images/Navigation/Rollovers_Navmain/nav_but_start.jpg);}
a#anc:visited img {background-image: url(../Images/Navigation/Rollovers_Navmain/nav_but_research.jpg);}
a#map:visited img {background-image: url(../Images/Navigation/Rollovers_Navmain/nav_but_map.jpg);}
a#tch:visited img {background-image: url(../Images/Navigation/Rollovers_Navmain/nav_but_teachers.jpg);}
a#crd:visited img {background-image: url(../Images/Navigation/Rollovers_Navmain/nav_but_credits.jpg);}


a#hme:hover img {background-image: url(../Images/Navigation/Rollovers_Navmain/nav_but_home_o.jpg);}
a#str:hover img {background-image: url(../Images/Navigation/Rollovers_Navmain/nav_but_start_o.jpg);}
a#anc:hover img {background-image: url(../Images/Navigation/Rollovers_Navmain/nav_but_research_o.jpg);}
a#map:hover img {background-image: url(../Images/Navigation/Rollovers_Navmain/nav_but_map_o.jpg);}
a#tch:hover img {background-image: url(../Images/Navigation/Rollovers_Navmain/nav_but_teachers_o.jpg);}
a#crd:hover img {background-image: url(../Images/Navigation/Rollovers_Navmain/nav_but_credits_o.jpg);}