var image = []
var images2 = []
var images3 = []
var images4 = []
var imageindex = []
var imagemaxindex = []

function initialise_order_slide_show()
  {
  var i
  for (i = 0; i <= 4; i++) images2[i] = 'images/order2'+i+'.jpg'
  for (i = 0; i <= 6; i++) images3[i] = 'images/order3'+i+'.jpg'
  for (i = 0; i <= 6; i++) images4[i] = 'images/order4'+i+'.jpg'
  for (i = 2; i <= 4; i++)
    {
    eval('imagemaxindex[i] = images'+i+'.length-1') 
    image[i] = document.getElementById('order'+i)
    imageindex[i] = 0
    load_new_image(i)
    }
  }

function previous_image(n)
  {
  if (imageindex[n] == 0)
    imageindex[n] = imagemaxindex[n]
  else
    imageindex[n]--
  load_new_image(n)
  }

function next_image(n)
  {
  if (imageindex[n] == imagemaxindex[n])
    imageindex[n] = 0
  else
    imageindex[n]++
  load_new_image(n)
  }
  
function load_new_image(n)
  {
  eval('image[n].src = images'+n+'[imageindex[n]]')
  // Preload next image
  var i = new Image()
  eval('i.src = images'+n+'[imageindex[n]+1]')
  }