var current_gallery_image = 0;

function previousGalleryImage() {
//alert("previous: " + current_gallery_image);
	current_gallery_image = toggleGalleryImages(--current_gallery_image);
}

function nextGalleryImage() {
//alert("next: " + current_gallery_image);
	current_gallery_image = toggleGalleryImages(++current_gallery_image);
}

function toggleGalleryImages(image_id) {
	gallery_images = document.getElementById("gallery-display").getElementsByTagName("a");
	for (i = 0; i < gallery_images.length; i++) {
		gallery_images.item(i).style.display = 'none';
	}
	
	if (image_id < 0) {
//alert("image_id < 0: " + image_id);
		image_id = gallery_images.length - 1;
		gallery_images.item(image_id).style.display = 'block';
	} else if (image_id >= gallery_images.length) {
//alert("image_id >= gallery_images.length: " + image_id);
		image_id = 0;
		gallery_images.item(image_id).style.display = 'block';
	} else {
//alert("image_id: " + image_id);
		gallery_images.item(image_id).style.display = 'block';
	}
//	current_gallery_image
	return image_id;
}



var current_project_episode = 0;

function previousProjectEpisode() {
//alert("previous: " + current_project_episode);
	current_project_episode = toggleProjectEpisodes(--current_project_episode);
}

function nextProjectEpisode() {
//alert("next: " + current_project_episode);
	current_project_episode = toggleProjectEpisodes(++current_project_episode);
}

function toggleProjectEpisodes(episode_id) {
	gallery_images = document.getElementById("video-display").getElementsByTagName("li");
	for (i = 0; i < gallery_images.length; i++) {
		gallery_images.item(i).style.display = 'none';
	}
	
	if (episode_id < 0) {
//alert("episode_id < 0: " + episode_id);
		episode_id = gallery_images.length - 1;
		gallery_images.item(episode_id).style.display = 'block';
	} else if (episode_id >= gallery_images.length) {
//alert("episode_id >= gallery_images.length: " + episode_id);
		episode_id = 0;
		gallery_images.item(episode_id).style.display = 'block';
	} else {
//alert("episode_id: " + episode_id);
		gallery_images.item(episode_id).style.display = 'block';
	}
//	current_project_episode
	return episode_id;
}