var YearCounter = year.length-1;
var PictureCounter = 0;
var nrOfPictures = year[YearCounter][3].length;

function dw(string) 
{ 
  document.write(string); 
}

function ChangeImage(fFwd)
{
  if (fFwd)
  {
    if (++PictureCounter==nrOfPictures)
      PictureCounter=0;
  }
  else
  {
    if (PictureCounter==0)
      PictureCounter=nrOfPictures;
    PictureCounter--;
  }
  ShowPicture();
}

function ShowPicture()
{
  if(year[YearCounter][3]!=null)
  {
    if(year[YearCounter][3][PictureCounter][0]!="")
    {
      document.images['Pictures'].src = path_pre + year[YearCounter][3][PictureCounter][0];
    }
    else
    {
      document.images['Pictures'].src = path_pre + "images/null.gif";
      document.images['Pictures'].height = 0;
    }
    document.getElementById('PictureDescription').innerHTML = year[YearCounter][3][PictureCounter][1];
    document.getElementById('ThisPicture').innerHTML = ' ' + (PictureCounter+1) + ' / ' + nrOfPictures + ' ';
  }else
  {
    document.images['Pictures'].src = path_pre + "images/null.gif";
    document.images['Pictures'].height = 0;
    document.getElementById('PictureDescription').innerHTML = "";
    document.getElementById('ThisPicture').innerHTML = ' 0 / 0 ';
  }
  
  document.getElementById('Year').innerHTML = year[YearCounter][4];
  
  document.getElementById('Theme').innerHTML = year[YearCounter][0];
  if(year[YearCounter][0]!='')
    document.getElementById('Theme_Text').innerHTML = "<BR>Thema:";
  else
    document.getElementById('Theme_Text').innerHTML = "";
  
  document.getElementById('Subject').innerHTML = year[YearCounter][1];
  if(year[YearCounter][1]!='')
    document.getElementById('Subject_Text').innerHTML = "<BR>Onderwerp:";
  else
    document.getElementById('Subject_Text').innerHTML = "";
    
  document.getElementById('AfterPicure').innerHTML = year[YearCounter][2];
}

function setYear(form) 
{
  PictureCounter=0;
  YearCounter = form;
  
  year[YearCounter][3]!=null ?  nrOfPictures = year[YearCounter][3].length : nrOfPictures = 1;
  
  ShowPicture();
}