function niketa(n){
  if(n < 10)
    return '0'+n;
  else
    return ''+n;
}

function sanketa(n){
  if(n < 10)
    return '00'+n;
  else if(n < 100)
    return '0'+n;
  else
    return ''+n;
}

function venue(num){
  document.img.src = 'images/venue/DSCN00' + niketa(num) + '.jpg';
}

function screen(num){
  document.img.src = 'images/lwb-images/img1' + sanketa(num) + '.gif';
}