.navitem01 {
    height: 35px;
    width: 100px;
}

.navitem01 a {
    background-image: url(../images/one.jpg);
    background-repeat: no-repeat;
}

.navitem01 a:hover {
    background-image: url(../images/one_blurred.jpg);
    background-repeat: no-repeat;
}