$(function() {
  var imgs = [
    'images/common/navi_girls_hover.jpg',
    'images/common/navi_home_hover.jpg',
    'images/common/navi_links_hover.jpg',
    'images/common/navi_mail_hover.jpg',
    'images/common/navi_recruit_hover.jpg',
    'images/common/navi_system_hover.jpg',
    'images/common/navi_topics_hover.jpg',
    'images/common/navi_girls.jpg',
    'images/common/navi_home.jpg',
    'images/common/navi_links.jpg',
    'images/common/navi_mail.jpg',
    'images/common/navi_recruit.jpg',
    'images/common/navi_system.jpg',
    'images/common/navi_topics.jpg'
  ];

  for (var i=0 ; i < imgs.length ; i++) {
    (new Image()).src = imgs[i];
  }
});