// Insert preloaded image after it finishes loading
$('<img />')
    .attr('src', 'images/logo_400.png')
    .load(function(){
        $('#logo').append( $(this) );
        // Your other custom code
    });

$(document).ready(function(){
   $('#centrale').fadeIn(1000, function() {
   $('#date').effect('bounce', {direction: 'up', distance: 10, speed: 100}, 100, function() {
   $('#top_right').effect('slide', {direction: 'right'}, 1000, function() {
   $('#left_01').effect('slide', {direction: 'left'}, 1000, function() {
   $('#left_02').effect('slide', {direction: 'left'}, 1000, function() {
   });
   });
   });
   });
   });
   });