function setPreloader(){
  preloader = $("<div class='preloader'><div class='liquid'></div></div>");
  preloader.prependTo("body").hide().alignToWindow().fadeIn(100);
  $(".tela").maximizeToWindow();
  $(window).resize(function(){
    $(".tela").maximizeToWindow();
    preloader.alignToWindow();
  });
}

function refreshPreloader(items){
  var progresso = items/totalItems;
  blackout(1-progresso, true);

  $(".liquid").stop(true, true).animate({
    "width": Number(progresso*100)+"%"
  }, {
    duration: 200,
    easing: "easeOutBounce"
  });
  $(".preloader").css({
    "opacity": 1.3-progresso
  });
  if(progresso==1){
    $(".preloader").fadeOut(200,function(){
      $(this).remove();
    });
  }
}