#nav {
    list-style-type: none;
}
.nav_item_1 {
    margin-bottom: 15px;
    width: 228px;
    height: 32px;
    background: transparent url('../images/nav/nav_sprite.png') no-repeat 0px -18px;
}
.nav_item_2 {
    margin-bottom: 15px;
    width: 228px;
    height: 32px;
    background: transparent url('../images/nav/nav_sprite.png') no-repeat 0px -68px;
}
.nav_item_3 {
    margin-bottom: 12px;
    width: 228px;
    height: 32px;
    background: transparent url('../images/nav/nav_sprite.png') no-repeat 0px -118px;
}
.nav_item_4 {
    margin-bottom: 12px;
    width: 228px;
    height: 32px;
    background: transparent url('../images/nav/nav_sprite.png') no-repeat 0px -162px;
}
.nav_item_5 {
    margin-bottom: 12px;
    width: 228px;
    height: 32px;
    background: transparent url('../images/nav/nav_sprite.png') no-repeat 0px -208px;
}
.nav_item_6 {
    margin-bottom: 12px;
    width: 228px;
    height: 32px;
    background: transparent url('../images/nav/nav_sprite.png') no-repeat 0px -254px;
}
.nav_item_7 {
    margin-bottom: 12px;
    width: 228px;
    height: 32px;
    background: transparent url('../images/nav/nav_sprite.png') no-repeat 0px -300px;
}

.nav_item_8 {
    margin-bottom: 12px;
    width: 228px;
    height: 32px;
    background: transparent url('../images/nav/nav_sprite.png') no-repeat 0px -345px;    
}

.nav_item_1:hover, .nav_over_1 {
    margin-bottom: 15px;
    width: 228px;
    height: 32px;
    background: transparent url('../images/nav/nav_sprite.png') no-repeat -242px -18px;
}
.nav_item_2:hover, .nav_over_2 {
    margin-bottom: 15px;
    width: 228px;
    height: 32px;
    background: transparent url('../images/nav/nav_sprite.png') no-repeat -242px -68px;
}
.nav_item_3:hover, .nav_over_3 {
    margin-bottom: 12px;
    width: 228px;
    height: 32px;
    background: transparent url('../images/nav/nav_sprite.png') no-repeat -242px -118px;
}
.nav_item_4:hover, .nav_over_4 {
    margin-bottom: 12px;
    width: 228px;
    height: 32px;
    background: transparent url('../images/nav/nav_sprite.png') no-repeat -242px -162px;
}
.nav_item_5:hover, .nav_over_5 {
    margin-bottom: 12px;
    width: 228px;
    height: 32px;
    background: transparent url('../images/nav/nav_sprite.png') no-repeat -242px -208px;
}
.nav_item_6:hover, .nav_over_6 {
    margin-bottom: 12px;
    width: 228px;
    height: 32px;
    background: transparent url('../images/nav/nav_sprite.png') no-repeat -242px -254px;
}
.nav_item_7:hover, .nav_over_7 {
    margin-bottom: 12px;
    width: 228px;
    height: 32px;
    background: transparent url('../images/nav/nav_sprite.png') no-repeat -242px -300px;
}
.nav_item_8:hover, .nav_over_8 {
    margin-bottom: 12px;
    width: 228px;
    height: 32px;
    background: transparent url('../images/nav/nav_sprite.png') no-repeat -242px -345px;
}