if (document.images) {
  btn_logo = new Image();
  btn_logo.src = "/wp-content/themes/chuckgalle/images/btn_logo.jpg";
  btn_logo_on = new Image();
  btn_logo_on.src = "/wp-content/themes/chuckgalle/images/btn_logo_on.jpg";
  
  btn_about = new Image();
  btn_about.src = "/wp-content/themes/chuckgalle/images/btn_about.png";
  btn_about_on = new Image();
  btn_about_on.src = "/wp-content/themes/chuckgalle/images/btn_about_on.png";
  
  btn_the_book = new Image();
  btn_the_book.src = "/wp-content/themes/chuckgalle/images/btn_the_book.png";
  btn_the_book_on = new Image();
  btn_the_book_on.src = "/wp-content/themes/chuckgalle/images/btn_the_book_on.png";
  
  btn_blog = new Image();
  btn_blog.src = "/wp-content/themes/chuckgalle/images/btn_blog.png";
  btn_blog_on = new Image();
  btn_blog_on.src = "/wp-content/themes/chuckgalle/images/btn_blog_on.png";
  
  btn_events = new Image();
  btn_events.src = "/wp-content/themes/chuckgalle/images/btn_events.png";
  btn_events_on = new Image();
  btn_events_on.src = "/wp-content/themes/chuckgalle/images/btn_events_on.png";
  
  btn_contact = new Image();
  btn_contact.src = "/wp-content/themes/chuckgalle/images/btn_contact.png";
  btn_contact_on = new Image();
  btn_contact_on.src = "/wp-content/themes/chuckgalle/images/btn_contact_on.png";
  
  btn_latest_buzz = new Image();
  btn_latest_buzz.src = "/wp-content/themes/chuckgalle/images/btn_latest_buzz.png";
  btn_latest_buzz_on = new Image();
  btn_latest_buzz_on.src = "/wp-content/themes/chuckgalle/images/btn_latest_buzz_on.png";
  
  btn_buy_a_copy = new Image();
  btn_buy_a_copy.src = "/wp-content/themes/chuckgalle/images/btn_buy_a_copy.png";
  btn_buy_a_copy_on = new Image();
  btn_buy_a_copy_on.src = "/wp-content/themes/chuckgalle/images/btn_buy_a_copy_on.png";
  
  btn_twitter_bird = new Image();
  btn_twitter_bird.src = "/wp-content/themes/chuckgalle/images/btn_twitter_bird.png";
  btn_twitter_bird_on = new Image();
  btn_twitter_bird_on.src = "/wp-content/themes/chuckgalle/images/btn_twitter_bird_on.png";
  
  btn_hp_twitter = new Image();
  btn_hp_twitter.src = "/wp-content/themes/chuckgalle/images/btn_hp_twitter.png";
  btn_hp_twitter_on = new Image();
  btn_hp_twitter_on.src = "/wp-content/themes/chuckgalle/images/btn_hp_twitter_on.png";
  
  btn_hp_facebook = new Image();
  btn_hp_facebook.src = "/wp-content/themes/chuckgalle/images/btn_hp_facebook.png";
  btn_hp_facebook_on = new Image();
  btn_hp_facebook_on.src = "/wp-content/themes/chuckgalle/images/btn_hp_facebook_on.png";
  
  btn_hp_rss = new Image();
  btn_hp_rss.src = "/wp-content/themes/chuckgalle/images/btn_hp_rss.png";
  btn_hp_rss_on = new Image();
  btn_hp_rss_on.src = "/wp-content/themes/chuckgalle/images/btn_hp_rss_on.png";

  btn_support_home = new Image();
  btn_support_home.src = "/wp-content/themes/chuckgalle/images/btn_support_home.jpg";
  btn_support_home_on = new Image();
  btn_support_home_on.src = "/wp-content/themes/chuckgalle/images/btn_support_home_on.jpg";

  btn_support_about = new Image();
  btn_support_about.src = "/wp-content/themes/chuckgalle/images/btn_support_about.jpg";
  btn_support_about_on = new Image();
  btn_support_about_on.src = "/wp-content/themes/chuckgalle/images/btn_support_about_on.jpg";
  
  btn_support_buy_the_book = new Image();
  btn_support_buy_the_book.src = "/wp-content/themes/chuckgalle/images/btn_support_buy_the_book.jpg";
  btn_support_buy_the_book_on = new Image();
  btn_support_buy_the_book_on.src = "/wp-content/themes/chuckgalle/images/btn_support_buy_the_book_on.jpg";
  
  btn_support_blog = new Image();
  btn_support_blog.src = "/wp-content/themes/chuckgalle/images/btn_support_blog.jpg";
  btn_support_blog_on = new Image();
  btn_support_blog_on.src = "/wp-content/themes/chuckgalle/images/btn_support_blog_on.jpg";
  
  btn_support_events = new Image();
  btn_support_events.src = "/wp-content/themes/chuckgalle/images/btn_support_events.jpg";
  btn_support_events_on = new Image();
  btn_support_events_on.src = "/wp-content/themes/chuckgalle/images/btn_support_events_on.jpg";
  
  btn_support_contact = new Image();
  btn_support_contact.src = "/wp-content/themes/chuckgalle/images/btn_support_contact.jpg";
  btn_support_contact_on = new Image();
  btn_support_contact_on.src = "/wp-content/themes/chuckgalle/images/btn_support_contact_on.jpg";

}

function switchOn(imgName) {
    if (document.images) {
      document[imgName].src = eval(imgName + "_on.src");
    }
}
  
function switchOff(imgName) {
    if (document.images) {
      document[imgName].src = eval(imgName + ".src");
    }
}