$(document).ready(function() {$.get('http://nastycastyrecords.com/ads/index.php/core/display_ads/1', function(data){ $('#ads').prepend(data); var disp = 4; var total = $("#ads li").children().size() + disp - 1; var show = 0; setInterval( function() { var b = 1;  var last = 0; var totalon; $("#ads li").each(function(i){ if ($(this).hasClass("show")){ $(this).removeClass("show"); $(this).addClass("hide"); last = i + disp +1; b = i + 1; if (total < last){ b = last - total + show - 1; last = disp + b; show = 0; } } }); $("#ads li").slice(b,last).removeClass("hide"); $("#ads li").slice(b,last).addClass("show"); totalon = $("#ads li.show").children().size(); if (disp > totalon){  show = disp - totalon;  $("#ads li:lt("+show+")").removeClass("hide");  $("#ads li:lt("+show+")").addClass("show"); } }, 15000); }); });