// When document is ready...
$(document).ready(function() {
    // Call horizontalNav on the navigations wrapping element
    $('.full-width').horizontalNav({});
});

<nav class="horizontal-nav full-width">
    <ul>
        <li><a href="#">Navigation Item</a></li>
        <li><a href="#">Work</a></li>
        <li><a href="#">Blog</a></li>
        <li><a href="#">About</a></li>
        <li><a href="#">Contact</a></li>
    </ul>
</nav>

// There is no required CSS for this plugin to work properly
// but here is what is being used to style this demo
.horizontal-nav {
    background: #efefef;
    border-radius: 6px;
}
.horizontal-nav ul {
    background: #128F9A;
    float: left;
    text-align: center;
    border-radius: 6px;
    border: 1px solid #0e7079;
}
.horizontal-nav ul li {
    float: left;
    border-left: 1px solid #0e7079;
}
.horizontal-nav ul li:first-child {
    border-left: 0 none;
}
.horizontal-nav ul li a {
    display: block;
    padding: 10px 20px;
    color: #fff;
    border-top: 1px solid rgba(255,255,255, 0.25);
    border-left: 1px solid rgba(255,255,255, 0.25);
}
.horizontal-nav ul li:first-child a {
    border-left: 0 none;
}
.horizontal-nav ul li a:hover {
    background: #12808a;
}
.horizontal-nav ul li:first-child a {
    border-top-left-radius: 6px;
    border-bottom-left-radius: 6px;
}
.horizontal-nav ul li:last-child a {
    border-top-right-radius: 6px;
    border-bottom-right-radius: 6px;
}