function nnGetElementById(id, oParent)
{
   var i, layer, found=null;
   if (!oParent) oParent = window;
   for (i = 0; i < oParent.document.layers.length; i++) {
       layer = oParent.document.layers[i];
       if (layer.id == id) return layer;
       if (layer.document.layers.length) found = nnGetElementById(id,layer);
       if (found) return found;
   }
   return null;
}

function getLayer(id)
{
   var layer = null;
   if (document.getElementById) layer = document.getElementById(id); 
   else if (document.all)       layer = document.all[id];
   else if (document.layers)    layer = nnGetElementById(id,null);
   return layer;
}


function hiliteMenu(id,b,a) 
{
    var item = getLayer(id);
    if (item) { item.className = b ? 'MenuBoxHover' : a ? 'MenuBoxActive' : 'MenuBoxNorm'; }
}