Stuck adding multitier, need help!

Stuck adding multitier, need help!

I thought I could get this working with my first UL, doesn't seem to be
cooperating very much though. Anyone mind helping me find out how
to add the ability to traverse up to four tiers? Much MUCH appreciated!

$(document).ready(function(){

   $("ul.subnav").parent().append("<span></span>"); //Only shows drop down trigger when js is enabled - Adds empty span tag after ul.subnav
   
   $("ul.topnav li span").hover(function() { //When trigger is onHover...
      
      //Following events are applied to the subnav itself (moving subnav up and down)
      $(this).parent().find("ul.subnav").slideDown('fast').show(); //Drop down the subnav on click
      $(this).find('ul:first:hidden').css({visibility: "visible",display: "none"}).show(400);
      $(this).find('ul:first').css({visibility: "hidden"});
      
      $(this).parent().hover(function() {
      }, function(){   
         $(this).parent().find("ul.subnav").slideUp('slow'); //When the mouse hovers out of the subnav, move it back up
         
      });

      //Following events are applied to the trigger (Hover events for the trigger)
      }).hover(function() {
         $(this).addClass("subhover"); //On hover over, add class "subhover"
      }, function(){   //On Hover Out
         $(this).removeClass("subhover"); //On hover out, remove class "subhover"
   });

});


And here's my body to body to see the syntax I'm using
[code]
<body>
<div class="container">

    <div id="header">
     <div class="disclaimer"></div>
      <ul class="topnav">
      
   
<li><a href="#">Lighting</a>
<ul class="subnav">

<li><a href="#">PR LIGHTING</a>
<ul class="subnav">
<li><a href="http://omnisistem.com/layers/Lighting/prl-ar.php">Architectural</a></li>   
<li><a href="http://omnisistem.com/layers/Lighting/prl-cp.php">Centerpieces</a></li>   

<li><a href="http://omnisistem.com/layers/Lighting/prl-dj.php">DJ Pro Series</a></li>   
<li><a href="http://omnisistem.com/layers/Lighting/prl-fs.php">Followspots</a></li>   
<li><a href="http://omnisistem.com/layers/Lighting/prl-my.php">Moving Yoke</a></li>   
</ul></li>
   

<li><a href="#">NOVALIGHT</a>
<ul class="subnav">
<li><a href="http://omnisistem.com/layers/Lighting/nvl-sl.php">Searchlights</a></li>   
</ul></li>
   

<li><a href="#">OMNILITE</a>

<ul class="subnav">
<li><a href="http://omnisistem.com/layers/Lighting/lit-cr.php">Controllers</a></li>   
<li><a href="http://omnisistem.com/layers/Lighting/lit-fx.php">Effect Lighting</a></li>   
<li><a href="http://omnisistem.com/layers/Lighting/lit-il.php">Intelligent</a></li>   
<li><a href="http://omnisistem.com/layers/Lighting/lit-ld.php">LED Lighting</a></li>   
<li><a href="http://omnisistem.com/layers/Lighting/lit-se.php">Special Effects</a></li>   
<li><a href="http://omnisistem.com/layers/Lighting/lit-uv.php">UV Lighting</a></li>   
<li><a href="http://omnisistem.com/layers/Lighting/lit-st.php">Stands</a></li>   
</ul></li>
   


<li><a href="#">PSL</a>
<ul class="subnav">
<li><a href="http://omnisistem.com/layers/Lighting/psl-ar.php">Architectural</a></li>   
<li><a href="http://omnisistem.com/layers/Lighting/psl-cp.php">Centerpieces</a></li>   
<li><a href="http://omnisistem.com/layers/Lighting/psl-fx.php">Effect Lighting</a></li>   
<li><a href="http://omnisistem.com/layers/Lighting/psl-fo.php">Fiber Optic</a></li>   
<li><a href="http://omnisistem.com/layers/Lighting/psl-il.php">Intelligent</a></li>   
<li><a href="http://omnisistem.com/layers/Lighting/psl-se.php">Special Effects</a></li>   
<li><a href="http://omnisistem.com/layers/Lighting/psl-th.php">Theatrical</a></li>   

<li><a href="http://omnisistem.com/layers/Lighting/lit-uv.php">UV Lighting</a></li>   
</ul></li>
   
</ul></li>
   

<li><a href="#">LED</a>
<ul class="subnav">
<li><a href="http://omnisistem.com/layers/LED/led-fx.php">Effects</a></li>   
<li><a href="http://omnisistem.com/layers/LED/led-pc.php">Par Cans</a></li>   
<li><a href="http://omnisistem.com/layers/LED/led-my.php">Moving Yoke</a></li>   
<li><a href="http://omnisistem.com/layers/LED/led-sp.php">Strips</a></li>   

<li><a href="http://omnisistem.com/layers/LED/led-ps.php">Panels</a></li>   
<li><a href="http://omnisistem.com/layers/LED/led-vw.php">Video Walls</a></li>   
</ul></li>
   

<li><a href="#">Lasers</a>
<ul class="subnav">
<li><a href="http://omnisistem.com/layers/Lasers/lsr-pr.php">Professional</a></li>   
<li><a href="http://omnisistem.com/layers/Lasers/lsr-sp.php">Semi-Professional</a></li>   
<li><a href="http://omnisistem.com/layers/Lasers/lsr-dj.php">DJ & Club</a></li>   

<li><a href="http://omnisistem.com/layers/Lasers/lsr-la.php">Accessories</a></li>   
</ul></li>
   

<li><a href="#">Omni Cables</a>
<ul class="subnav">
<li><a href="http://omnisistem.com/layers/Omni Cables/cbl-al.php">All Cables</a></li>   
</ul></li>
   

<li><a href="#">Omni Cases</a>
<ul class="subnav">
<li><a href="http://omnisistem.com/layers/Omni Cases/css-hd.php">Hard</a></li>   
<li><a href="http://omnisistem.com/layers/Omni Cases/css-sf.php">Soft</a></li>   

<li><a href="http://omnisistem.com/layers/Omni Cases/css-rd.php">Road</a></li>   
<li><a href="http://omnisistem.com/layers/Omni Cases/css-fl.php">Flight</a></li>   
</ul></li>
   
<li><a href="http://omnisistem.com/layers/Omni Sound/snd-al">Omni Sound</a></li>   

<li><a href="#">TrussSistems</a>
<ul class="subnav">
<li><a href="http://omnisistem.com/layers/TrussSistems/trs-cl.php">Clamps</a></li>   
<li><a href="http://omnisistem.com/layers/TrussSistems/trs-tr.php">Truss</a></li>   
</ul></li>
   
      </ul>

     </div>
   </div>

   
</body>


Thanks Guys!
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