#macro (printNodes $node)
  #if ($node.ChildNodes.Count > 0)
    <ul class="sub-menu">
      #foreach( $subNavItem in $node.ChildNodes )
        <li><a href="$subNavItem.URL">$subNavItem.Title</a></li>
        #printNodes  ($subNavItem)
      #end
    </ul>
  #end
#end

<ul class="main-menu">
  #foreach( $navItem in $navItems )
    #set ($var = $velocityCount)
    #if( $var < 7 )                    
      <li><a href="$navItem.URL">$navItem.Title</a>
        #printNodes  ($navItem)                 
      </li>
    #else
      <li> <a href="$navItem.URL">$navItem.Title</a>                     
        #printNodes  ($navItem)  
      </li>
    #end  
  #end
</ul>