jQuery Page Preloader

<div class="loader">
  <div class="loader_inner"></div>
</div>

.loader {
  background: none repeat scroll 0 0 #ffffff;
  bottom: 0;
  height: 100%;
  left: 0;
  position: fixed;
  right: 0;
  top: 0;
  width: 100%;
  z-index: 9999; 
}
.loader .loader_inner {
  background-image: url("../images/loader.gif");
  background-size: cover;
  background-repeat: no-repeat;
  background-posirion: center center;
  background-color: #fff;
  height: 160px;
  width: 160px;
  margin-top: -80px;
  margin-left: -80px;
  left: 50%;
  top: 50%;
  position: absolute; 
}
  
$(window).load(function() {
  $(".loader_inner").fadeOut();
  $(".loader").delay(400).fadeOut("slow");
});