var currentPosition = 0;
var slideHeight = 250;
var slides;
var numberOfSlides;
var timer; 

$(document).ready(function(){
  slides = $('.sliderContent > img');
  numberOfSlides = slides.length -1;
  if(numberOfSlides > 0)
   timer = setTimeout('shiftPicture(1)', 8000);
});

  
function shiftPicture(whichWay)
  {
    clearTimeout(timer);
    
    if(currentPosition >= numberOfSlides)
    {
      currentPosition = 0;
    }
    else
    {
       currentPosition = currentPosition + 1; 
    }
        // Move container with fade
    $('.sliderContent').fadeOut('fast', function(){
      
      $('.sliderContent').css({'top' : slideHeight * (-currentPosition)});
      
    });
    
    $('.sliderContent').fadeIn('slow');
    
    timer = setTimeout('shiftPicture(1)', 8000);
  }