jQuery(function( $ ){

 $.preload( '#main_center_column img', {//the first argument is a selector to the images
 placeholder:'../images/loading_1.gif',//this is the really important option
 notFound:'../images/notfound.jpg',//optional image if an image wasn't found
 threshold: 1 //'2' is the default, how many at a time, to load.
 });
 
  });

$(document).ready(function(){
  $.preloadCssImages();
});