Walker Class Help

<div id="header-menu">
	<div id="header-menu-inside">
		<ul class="menu">
			<li class="first leaf"><a class="active" href="#">Link 1</a></li>
			<li class="leaf"><a href="#">Link 2</a></li>
			<li class="leaf"><a href="#">Link 3</a></li>
			<li class="leaf"><a href="#">Link 4</a></li>
			<li class="expanded"><a href="#">Link 5</a>
				<ul class="menu">
					<li class="first leaf"><a href=#">Sub Link 5a</a></li>
					<li class="leaf"><a href="#">Sub Link 5b</a></li>
					<li class="last leaf"><a href="#">Sub Link 5c</a></li>
				</ul>
			</li>
			<li class="expanded"><a href="#">Link 6</a>
				<ul class="menu">
					<li class="first last leaf"><a href="#">Sub Link 6a</a></li>
				</ul>
			</li>
			<li class="leaf"><a title="" href="#">Link 7</a></li>
			<li class="leaf"><a title="" href="#">Link 8</a></li>
			<li class="leaf"><a title="" href="#">Link 9</a></li>
			<li class="last leaf"><a title="" href="#">Link 10</a></li>
		</ul>
	</div>
</div>