/*
 *
 * This file preloads the images used in the fade in/out feature AFTER 
 * most of the rest of the page has loaded.  This script will be included 
 * LAST in index.php.  We call the startSlideShow() function after we
 * have loaded all slide show images.  This script was found and adapted 
 * from:
 * 
 * http://www.webreference.com/programming/javascript/gr/column3/
 *
 */

//
// array of photos
//

var preload_photo_array = new Array();

preload_photo_array[0] = "images/2006-04-02-05-WhatsThatPlease-450x337.jpg";
preload_photo_array[1] = "images/2006-04-02-09-Whoo-450x337.jpg";
preload_photo_array[2] = "images/2006-04-02-10-HikerTrash-450x337.jpg";
preload_photo_array[3] = "images/2006-06-18-08-AfternoonOnTundra-450x337.jpg";
preload_photo_array[4] = "images/2006-06-18-02-DaveLaughs-450x337.jpg";
preload_photo_array[5] = "images/2006-06-10-07-NahumStyleKing-450x337.jpg";
preload_photo_array[6] = "images/2006-06-10-02-MostOfTheCrew-450x337.jpg";
preload_photo_array[7] = "images/2006-03-25-02-Tracks-450x337.jpg";
preload_photo_array[8] = "images/2006-01-01-ViewFromFirstFlatiron-450x337.jpg";
preload_photo_array[9] = "images/20060624D1-45-RomAndJeniaAscendingUNotch-Sierras.JPG";
preload_photo_array[10] = "images/20060626D2-08-Palisades-Sierras.JPG";
preload_photo_array[11] = "images/20060626D2-43-AJOnSillSummit-Sierras.JPG";
preload_photo_array[12] = "images/20060729D1-58-AJCanyoneering-LowerWolfCreek.JPG";
preload_photo_array[13] = "images/20060811D2-03-Sunset-ZirkelWilderness.JPG";
preload_photo_array[14] = "images/20060825D2-14-GrandCanyonOfTuolumneViews.JPG";
preload_photo_array[15] = "images/20060903D3-49-MikeAndSteveRiverHikingInDinosaurNM-crop.jpg";
preload_photo_array[16] = "images/20060909D1-45-GroupAtDiamondLake.JPG";
preload_photo_array[17] = "images/20060928D2-18-DaveCanyoneering-ZionNP.JPG";
preload_photo_array[18] = "images/20061001D1-47-TedCanyoneering-KolobCreekZionNP-crop.jpg";
preload_photo_array[19] = "images/20061021D1-24-GroupCanyoneeringRoostArea-Utah.JPG";
preload_photo_array[20] = "images/20061022D2-40-GroupCanyoneering-Utah.JPG";
preload_photo_array[21] = "images/20061123D2-58-JonasandChuckCanyoneeringWestPasture-Utah-crop.jpg";
preload_photo_array[22] = "images/IMG_0372.JPG";
preload_photo_array[23] = "images/IMG_0458.JPG";
preload_photo_array[24] = "images/Marmots.jpg";
preload_photo_array[25] = "images/aai.jpg";
preload_photo_array[26] = "images/aba.jpg";
preload_photo_array[27] = "images/abk.jpg";
preload_photo_array[28] = "images/ace_approaching_glass_lake.jpg";
preload_photo_array[29] = "images/acn_sunrise_from_tremont.jpg";
preload_photo_array[30] = "images/acv.jpg";
preload_photo_array[31] = "images/adiBRAINARD_CABIN_MAR6&7.jpg";
preload_photo_array[32] = "images/aek_Valleicto_Valley_in_San_Juans.jpg";
preload_photo_array[33] = "images/afa.jpg";
preload_photo_array[34] = "images/afi.jpg";
preload_photo_array[35] = "images/ahgSTVRAINMTN0718.jpg";
preload_photo_array[36] = "images/ahr_isabelle_glacier.jpg";
preload_photo_array[37] = "images/aik.jpg";
preload_photo_array[38] = "images/aim.jpg";
preload_photo_array[39] = "images/ajc_butterly_on_aster.jpg";
preload_photo_array[40] = "images/ajf_moose_and_two_calves.jpg";
preload_photo_array[41] = "images/akg_Mandy_top_of_Buchanan_Pass.jpg";
preload_photo_array[42] = "images/akn.jpg";
preload_photo_array[43] = "images/amfMONARCH_LAKE_AUG7.jpg";
preload_photo_array[44] = "images/anj.JPG";
preload_photo_array[45] = "images/arf.JPG";

ImagePreloader.prototype.onComplete = function() {
	this.nProcessed++;

	if (this.nProcessed == this.nImages) {
		this.callBack();
	}
} 


ImagePreloader.prototype.onload = function() {
	this.bLoaded = true;

	// In IE and FireFox and Opera this will be the img element that was just loaded,
	// in Safari this will be the top level window object.  So to work around this 
	// a global reference to the top ImagePreloader object is saved and we'll use that
	// below instead.

	if (this.oImagePreloader) {
		this.oImagePreloader.nLoaded++;
		this.oImagePreloader.onComplete();
	}
	else {
		ourIp.nLoaded++;
		ourIp.onComplete();
	}
} 


ImagePreloader.prototype.onerror = function() {
	this.bError = true;
	this.oImagePreloader.onComplete();
} 


ImagePreloader.prototype.onabort = function() {
	this.bAbort = true;
	this.oImagePreloader.onComplete();
}


ImagePreloader.prototype.preload = function(image) {
	// create new Image object and add to array
	var oImage = new Image();
	this.aImages.push(oImage);

	// set up event handlers for the Image object
	oImage.onload = ImagePreloader.prototype.onload;
	oImage.onerror = ImagePreloader.prototype.onerror;
	oImage.onabort = ImagePreloader.prototype.onabort;

	// assign pointer back to this.
	oImage.oImagePreloader = this;
	oImage.bLoaded = false;

	// assign the .src property of the Image object
	oImage.src = image;
} 


function ImagePreloader(images, callBack) {
	// store the callBack
	this.callBack = callBack;

	// initialize internal state.
	this.nLoaded = 0;

	this.nProcessed = 0;
	this.aImages = new Array;

	// record the number of images.
	this.nImages = images.length;

	// Save global reference for possible later use!
	ourIp = this;

	// for each image, call preload()
	for (var i = 0; i < images.length; i++) {
		this.preload(images[i]);
	}
} // end ImagePreloader()


function startSlideShow() {
	slideShow(-1);
}

// We save a global copy of the ImagePreloader object in case we don't have a reference to it later...
var ourIp = null;