Silverstripe nested navigation

SS_Menu

<ul id='nav'>
	<% control Menu(1) %>
		<% if Children %>
			<li id='nav-$ID' class="$LinkingMode $FirstLast">
				<a href="$Link">$MenuTitle</a>
				<ul class="submenu $LinkingMode">
					<% control Children %>	
						<% if Children %>
			            	<li id='nav-$ID' class="$LinkingMode $FirstLast">
				                <a href="$Link">$MenuTitle</a>
								<ul>
									<% control Children %>				 
						            	<li id='nav-$ID' class='$LinkingMode $FirstLast'>
						                	<a href="$Link">$MenuTitle</a>
						                </li>              
							        <% end_control %>
				                </ul>
							</li>
			            <% else %>            
		                	<li id='nav-$ID' class='$LinkingMode $FirstLast'>
		                		<a href="$Link">$MenuTitle</a>
		                	</li>           
			             <% end_if %>          
					<% end_control %>
				</ul>
			</li>
		<% else %>	
			<li id='nav-$ID' class="$LinkingMode $FirstLast">
				<a href="$Link">$MenuTitle</a>
			</li>
		<% end_if %>		
	<% end_control %>
</ul>