How to make my fixed "mobile-nav" bar appear when I scroll down the page? -

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#web-nav {    display: none;  }  #mobile-nav {    width: 100%;    background: url(img/menu-bg.png) repeat;    height: 70px;    display: block;    position: fixed;    z-index: 50;    top: 0px;  }
<nav id="mobile-nav">    <a href="index.html">      <img class="logo" src="admin/wp-content/themes/mame/assets/img/sicklehammer.png" />    </a>    <img class="drop-nav" src="open.png" />  </nav>  <nav id="mobile-expand">    <img class="logo" src="logo.png" />    <img class="close" src="img/close.png" />    <div id="hidden-nav">      </div>      <ul id="menu">        <li><a href="index.html">home</a>      </li>      <li><a href="work/index.html">work</a>      </li>      <li><a href="about/index.html">about</a>      </li>      <li><a href="blog/index.html">blog</a>      </li>      <li><a href="contact/index.html">contact</a>      </li>      <ul class="work-subs">          <li><a href="/index.html">movies</a>        </li>        <li><a href="/index.html">photos</a>        </li>      </ul>    </ul>  </nav>

this use <script> $('#main-nav').hide(); $(window).scroll(function () { if ($(this).scrolltop() > 750) { $('#main-nav').fadein(); } else { $('#main-nav').fadeout(); } });


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