I want to hide a label base on session value in jsp

Question

<nav id= "top_nav" class="main-manu"> 

<ul>

<li class="current"><a href="">Home</a></li>

<li><a href="#schedule" onclick="navtoschedule()">Movie</a></li>

<li><a href="Trailer.html">Trailer</a></li>

<li><a href="">Offer</a></li>

<li><a href="#" id="register">Register</a></li>

<li><a href="#" id="Login">Log in</a></li>

<li><a href="#" id="LogOut">Log Out</a></li>

</ul>

</nav>

I want to hide the logout label base on the session value if session value null then label will be display other wise no how i do that ....