div#header td.inactive{background: URL(img/main_inactive.jpg) bottom no-repeat;}
div#header td.active{background: URL(img/main_active_spring.jpg) bottom no-repeat;}

div#menu td.inactive {background: URL(img/sub_inactive.jpg) bottom no-repeat;}
div#menu td.active {background: URL(img/sub_active.jpg) bottom no-repeat;}