$(document).ready(function(){
  slideShow();
  $(".fpartner li:first").addClass("is-showing");
});
function slideShow() {
  var showing = $('.fpartner .is-showing');
  var next = showing.next().length ? showing.next() : showing.parent().children(':first');
  showing.fadeOut(800, function() { next.fadeIn(800).addClass('is-showing'); }).removeClass('is-showing');
  setTimeout(slideShow, 5000);
}