var TREE_NODES = [
  ['Birds', null, null, 
    ['Bittern & Heron', '../main/bittern.htm', null], 
	['Grebes', '../main/grebes.htm', null],
    ['Grouse & Game Birds', '../main/grouse.htm', null], 
    ['Passerines', null, null, 
      ['Assorted Small', '../main/assorted.htm', null], 
      ['Crows & Woodpeckers', '../main/crows.htm', null], 
      ['Thrushes, Dippers, Waxwings', '../main/thrushes.htm', null], 
      ['Tits', '../main/tits.htm', null]], 
    ['Raptors', '../main/raptors.htm', null], 
    ['Seabirds', null, null, 
      ['Gulls and Fulmar', '../main/gulls.htm', null], 
      ['Puffin, Razorbill, Guillemot', '../main/puffin.htm', null]], 
    ['Terns', '../main/terns.htm', null], 
    ['Waders', '../main/waders.htm', null], 
    ['Waterfowl', null, null,
  	  ['Ducks', '../main/ducks.htm', null], 
	  ['Geese and Swans', '../main/geese.htm', null]]],      
  ['Fungi & Lichen', null, null, 
    ['Fungi', '../main/fungi.htm', null], 
    ['Lichen', '../main/lichen.htm', null]], 
  ['Insects', null, null, 
    ['Bees, Wasp, Ants', null, null, 
      ['Ants', '../main/ants.htm', null], 
	  ['Bees', '../main/bees.htm', null],
      ['Wasps', '../main/wasps.htm', null]], 
    ['Beetles', null, null,
	  ['Ladybirds', '../main/ladybirds.htm', null],
      ['Other Beetles', '../main/beetles.htm', null]], 
    ['Butterflies and Moths', null, null, 
      ['Butterflies', null, null, 
        ['Blues', '../main/blues.htm', null],
        ['Browns', '../main/browns.htm', null], 
        ['Coppers and Duke of Burgundy', '../main/coppers.htm', null], 
        ['Fritillaries', '../main/fritillaries.htm', null], 
        ['Hairstreaks', '../main/hairstreaks.htm', null], 
        ['Life Cycles', '../main/cycles.htm', null], 
        ['Skippers', '../main/skippers.htm', null], 
        ['Vanessas', '../main/vanessas.htm', null], 
        ['Whites etc.', '../main/whites.htm', null]], 
      ['Moths', null, null,
        ['Assorted Moths', '../main/moths.htm', null],
        ['Hawkmoths', '../main/hawkmoths.htm', null]]],
    ['Dragonflies and Damselflies', null, null,
	  ['Damselflies', '../main/damsels.htm', null],
      ['Dragonflies', '../main/dragons.htm', null]], 	 
    ['Hoverflies', '../main/hoverflies.htm', null], 
    ['Other Insects', '../main/insects.htm', null], 
    ['Sawflies', '../main/sawflies.htm', null]], 
  ['Landscapes', null, null, 
    ['Autumn Colours', '../main/autumn.htm', null], 
    ['Isle of May', '../main/may.htm', null], 
    ['Isle of Skye', '../main/skye.htm', null], 
    ['Peak District', '../main/peaks.htm', null], 
    ['Weather', '../main/weather.htm', null], 
    ['Yorkshire Dales', '../main/dales.htm', null]], 
  ['Mammals', null, null,
    ['Badger, Mink etc.', '../main/badger.htm', null], 
    ['Bats', '../main/bats.htm', null], 
    ['Deer', '../main/deer.htm', null], 
    ['Hare and Rabbit', '../main/hare.htm', null], 
    ['Mice, Rats, Vole, Shrew', '../main/mice.htm', null], 
    ['Otter', '../main/otter.htm', null], 
    ['Seals', '../main/seals.htm', null], 
    ['Squirrels', '../main/squirrels.htm', null], 
	['Wild Cat, Wolf, Fox', '../main/cat.htm', null]],    
  ['Other Invertebrates', null, null,
    ['Slugs and Snails', '../main/slugs.htm', null], 
	['Spiders', '../main/spiders.htm', null]],   
  ['Other Vertebrates', null, null,
    ['Amphibians', '../main/amphibians.htm', null], 
    ['Crayfish', '../main/crayfish.htm', null], 
	['Reptiles', '../main/reptiles.htm', null]],  
  ['Plants', null, null,
    ['Orchids', '../main/orchids.htm', null], 
    ['Trees and Shrubs', '../main/trees.htm', null], 
	['Wild Flowers', '../main/flowers.htm', null]],  
];