Nav背景以匹配身体背景图像Css

我有一个水平导航条，我想在滚动时使用position:fixed来保持它，并且我有一个子窗口和不同颜色的div。我想要的是导航在滚动时与主div的图像匹配，当主div结束时，再次开始在该图像上滚动，就像循环一样。

这可能吗？这是我正在使用的CSS：

#nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 7%;
    text-align: center;
    padding: .5em 0 1em 0;
    z-index: 1;
    overflow: hidden;
    background-image: inherit;
}
#nav > ul {
    line-height: 0px;
    position: relative;
    display: inline-block;
    margin: 0;
    height: 21px;
    border-left: solid 1px rgba(192,192,192,0.35);
    border-right: solid 1px rgba(192,192,192,0.35);
}
#header {
    position: relative;
    background-image: url('../images/header.jpg');
    background-size: cover;
    background-position: center center;
    background-attachment: fixed;
    color: #fff;
    text-align: center;
    padding: 2.5em 0 2em 0;
    cursor: default;
}
#banner {
    background: #fff;
    text-align: center;
    padding: 4.5em 0 4.5em 0;
}

Header和Banner是我使用的两个不同的div部分。。

这是我使用的HTML。

    <!-- Header -->
    <div id="header">
        <!-- Inner -->
        <div class="inner">
            <header>
                <h2>Por<br/>Veracruz</h2>
                <span class="byline"><br>Tu ayudante hallando hospedaje<br> por el estado de Veracruz!</span>
            </header>
            <footer>
                <a href="#banner" class="button circled scrolly">Buscar!</a>
            </footer>
        </div>
        <!-- Nav -->
        <nav id="nav">
            <ul>
                <li><a href="index.html">Inicio</a></li>
                <li><a href="#banner" class="scrolly">Encuentra</a></li>
                <li><a href="right-sidebar.html">Aventura al Azar</a></li>
                <li><a href="no-sidebar.html">Contacto</a></li>
            </ul>
        </nav>
    </div>
    <!-- Banner -->
    <div id="banner">
        <h2>Hola! Te ayudamos a buscar?</h2>
            <div class="row half no-collapse-1">
                <div class="9u">
                    <input type="text" name="lugar" placeholder="Ayudanos con el lugar..." align="right"/>
                </div>
                <div class="3u" align="left">
                    <h3><a href="#" class="button" align="left">Buscar!</a></h3>
                    <br><br>
                </div>
                <div id="middle" class="12u" style="background: #2b252c;">
                    <font color="white"><h2><u>Lugares más visitados</u></font></h2>
                </div>
            </div>

    <!-- Carousel -->
    <div class="carousel">
        <div class="reel">
            <article>
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        </div>
    </div>

谢谢！