UL.alumni_bar {
    width: 585px;
    height: 30px;
    background: #600;
    padding: 0em;
    margin: 0em 0em 1em 0em;
}

UL.alumni_bar LI {
    padding: 0em;
    margin: 0em;
    display: inline;
}

UL.alumni_bar A {
    line-height: 30px;
    background: center top no-repeat;
    width: 142px;
    text-indent: -9999em;
    padding: 0em;
    margin: 0em;
    display: block;
    float: left;
}

UL.alumni_bar A:hover {
    background-position: bottom;
}

UL.alumni_bar LI.news A { background-image: url(images/alumni_bar_news.jpg); }
UL.alumni_bar LI.member A { background-image: url(images/alumni_bar_member.jpg); }
UL.alumni_bar Li.community A { background-image: url(images/alumni_bar_community.jpg); width: 147px; }
UL.alumni_bar LI.support A { background-image: url(images/alumni_bar_support.jpg); width: 154px; }


    <ul class="alumni_bar">
<li class="news"><a href="#">Send Us Your News</a></li>
<li class="member"><a href="#">Become a Member</a></li>
<li class="community"><a href="#">Online Community</a></li>
<li class="support"><a href="#">Support Florida Tech</a></li>
</ul>