function addImageErrorHandlers() {
  if(typeof(jQuery) != 'undefined') {
    // Add error handlers to all images with image_error class, and remove the class.
    jQuery('img.image_error').removeClass("image_error").error(function(){

      // The next span will contain the URL of another image.
      var failoverImage = jQuery(this).next('span.image_error');

      if (1 == failoverImage.length && failoverImage.attr('title').length > 0) {
        // Assign a new URL to this image.
        jQuery(this).attr('src', failoverImage.attr('title'));

        // Remove this failover image, so move on to the next one in the chain.
        failoverImage.remove();
      }
    });
  }
}