function slajdy(){
  var currentPosition = 0;
  var slideWidth = 430;
  var slides = $('.slajdy .nowosc');
  var numberOfSlides = slides.length;

  $('.slajdy').css('overflow', 'hidden');
  slides
    .wrapAll('<div id="slideInner"></div>')
    .css({
      'float' : 'left',
      'width' : slideWidth
    });
  $('#slideInner').css('width', slideWidth * numberOfSlides);
  $('#nowosci')
    .prepend('<span class="przewijanie" id="lewo">Przesuń w lewo</span>')
    .append('<span class="przewijanie" id="prawo">Przesuń w prawo</span>');
  manageControls(currentPosition);
  $('.przewijanie')
    .bind('click', function(){
    // Determine new position
    currentPosition = ($(this).attr('id')=='prawo') ? currentPosition+1 : currentPosition-1;
    manageControls(currentPosition);
    // Move slideInner using margin-left
    $('#slideInner').animate({
      'marginLeft' : slideWidth*(-currentPosition)
    });
  });
  function manageControls(position){
    if(position==0){ $('#lewo').hide() } else{ $('#lewo').show() }
    if(position==numberOfSlides-1){ $('#prawo').hide() } else{ $('#prawo').show() }
  }
}

function setEqualHeight(columns) {
    var tallestcolumn = 0;
    columns.each(
        function() {
            currentHeight = jQuery(this).height();
            if(currentHeight > tallestcolumn) {
                tallestcolumn  = currentHeight;
            }
        }
    );
    columns.height(tallestcolumn);
    delete tallestcolumn;
}