// Gallery Function
function showGallery(articleId){
	/* container which display the gallery content */
	var to = $('gallerybody');
	/* container which contain the gallery to display */
	var from = $("gallery"+articleId);
	
	to.innerHTML = from.innerHTML;
}

//Stores URL's for a specific gallery
var gallery_images = new Array();
//Stores text for a specific image caption
var gallery_captions = new Array();
//Stores the title of the gallery
var gallery_title = new Array();
//Stores the year of the image
var image_year = new Array();
//Stores the medium for the image
var image_medium = new Array();
//Stores the size of the image
var image_size = new Array();

//Stores the current gallery being browsed
var gallery_id = 0;
//Keeps track of what image we are looking at
var current_image_counter = 0;
//Used for preloading images in gallery_images
var preload = new Array();


//Switch image gallery, reset the current_image_counter to 0
//Then calls load_image() to display first image from the new gallery
function switch_gallery(section_id) {
  gallery_id = section_id;
  switch_gallery_title();
  current_image_counter = 0;
  load_image();
}

//Load images into html 'img' container named 'photo'
//Also loads the corresponding caption for the photo - see function caption()
function load_image() {
  var myFx = new Fx.Style('photo', 'opacity', {duration:250});
  myFx.start(1,0).chain(function() {
    $('photo').src = gallery_images[gallery_id][current_image_counter];
  });
	$('photo').addEvent('load', function() {
	  myFx.start(0,1).chain(function() {
    	caption();
    	show_position();  
	  });
	});
}

//Updates current_image_counter by adding 1 
//If we're at the end of that gallery, it sets current_image_counter to 0 so that we start back at the beginning
//It then calls function load_image()
function next_image() {
	if (current_image_counter == gallery_images[gallery_id].length-1) {
		current_image_counter = 0;
	} else {
	  current_image_counter++;
	}
	load_image();
}

//Updates current_image_counter by subtracting 1 
//If we're at the beginning of that gallery, it sets current_image_counter to the last image slot so that we then load the last image
//It then calls function load_image()
function previous_image() {
	if (current_image_counter == 0) {
		current_image_counter = gallery_images[gallery_id].length-1;
	} else {
	  current_image_counter--;
	}
	load_image();
}

//Displays the caption for the current displayed image in a div named 'captions'
function caption() {
	$('captions').innerHTML = gallery_captions[gallery_id][current_image_counter];
	
}

//Sets the gallery title to be displayed in the page
function switch_gallery_title() {
    title_element = document.getElementById("slideshow_title");
    title_element.innerHTML = gallery_title[gallery_id];
}

//Displays which image we are on (and out of however many images we have in our slideshow)
function show_position() {
  position_element = document.getElementById("position")
  position_element.innerHTML = current_image_counter+1 + "/" + gallery_images[gallery_id].length;
}


gallery_images[0] = new Array();
gallery_captions[0] = new Array();

//
//ONLY EDIT THE LINES BELOW
//


gallery_title[0] = "slideshow";

gallery_images[0][0] = '../Artwork/Paintings/Paintings_1.jpg';
gallery_captions[0][0] = '<p><br>509 State Street Mural<br>(enamel on panel)<br>Designer: Nicholas Dal Pra<br>\u00A92009 Nicholas Dal Pra</p>';

gallery_images[0][1] = '../Artwork/Paintings/Paintings_2.jpg';
gallery_captions[0][1] = '<p><br>Girls & Guns<br>(watercolor)<br>Designer: Nicholas Dal Pra<br>\u00A92009 Nicholas Dal Pra</p>';

gallery_images[0][2] = '../Artwork/Paintings/Paintings_3.jpg';
gallery_captions[0][2] = '<p><br>Play Something Else<br>(oil on canvas)<br>Designer: Nicholas Dal Pra<br>\u00A92009 Nicholas Dal Pra</p>';

gallery_images[0][3] = '../Artwork/Paintings/Paintings_4.jpg';
gallery_captions[0][3] = '<p><br>Girls & Guns<br>(oil on canvas)<br>Designer: Nicholas Dal Pra<br>\u00A92009 Nicholas Dal Pra</p>';

gallery_images[0][4] = '../Artwork/Paintings/Paintings_5.jpg';
gallery_captions[0][4] = '<p><br>Girls & Guns<br>(oil on canvas)<br>Designer: Nicholas Dal Pra<br>\u00A92009 Nicholas Dal Pra</p>';

gallery_images[0][5] = '../Artwork/Paintings/Paintings_6.jpg';
gallery_captions[0][5] = '<p><br>Untitled Girl(watercolor)<br>Designer: Nicholas Dal Pra<br>\u00A92009 Nicholas Dal Pra</p>';