var currentPosition = 0;
var slideHeight = 255;
var slides;
var numberOfSlides;
var timer = setTimeout('shiftPicture(1)', 8000);

$(document).ready(function(){
    slides = $('.headerSkift');
    numberOfSlides = slides.length -1;
    timer;
  
});
  
function shiftPicture(whichWay)
{
    clearTimeout(timer);
    if( currentPosition == numberOfSlides && whichWay == 1)
    {
      currentPosition = 0;
    }
    else if (currentPosition == 0 && whichWay == -1)
    {
      currentPosition = numberOfSlides;
    }
    else
    {
      currentPosition = currentPosition + whichWay;
    }
        // Move container with fade
    $('.slideContainer').fadeOut('fast', function(){
      
      $('.slideContainer').css({'margin-top' : slideHeight * (-currentPosition)});
      
    });
    
    $('.slideContainer').fadeIn({});
    
    timer = setTimeout('shiftPicture(1)', 8000);
}