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]],  
];