var arrMapImg = [];
var arrNavImg = [];
var arrSlides_A = [];
var arrSlides_B = [];
var arrSlides_C = [];
var arrSlides_D = [];
var arrayImageCount = 7;
var randomnumber = Math.random();
var preloadFlag = false;
var slideID, slide_A, slide_B, slide_C, slide_D;


// SLIDESHOW ARRAY POPULATION
arrSlides_A[0] = 'images/slides/almosthome03.jpg'
arrSlides_A[1] = 'images/slides/misc_cityscape02.jpg'
arrSlides_A[2] = 'images/slides/tellmeastory01.jpg'
arrSlides_A[3] = 'images/slides/takenin02.jpg'
arrSlides_A[4] = 'images/slides/misc_cityscape01.jpg'
arrSlides_A[5] = 'images/slides/grist03.jpg'
arrSlides_A[6] = 'images/slides/grist01.jpg'

arrSlides_B[0] = 'images/slides/misc_branch.jpg'
arrSlides_B[1] = 'images/slides/dancegoodbye01.jpg'
arrSlides_B[2] = 'images/slides/misc_clock.jpg'
arrSlides_B[3] = 'images/slides/sdogs01.jpg'
arrSlides_B[4] = 'images/slides/misc_car.jpg'
arrSlides_B[5] = 'images/slides/riskreward01.jpg'
arrSlides_B[6] = 'images/slides/takenin01.jpg'

arrSlides_C[0] = 'images/slides/grist02.jpg'
arrSlides_C[1] = 'images/slides/outofmymind02.jpg'
arrSlides_C[2] = 'images/slides/outofmymind01.jpg'
arrSlides_C[3] = 'images/slides/lourdes02.jpg'
arrSlides_C[4] = 'images/slides/nature01.jpg'
arrSlides_C[5] = 'images/slides/grandfathershouse01.jpg'
arrSlides_C[6] = 'images/slides/misc_womandance.jpg'

arrSlides_D[0] = 'images/slides/sdogs02.jpg'
arrSlides_D[1] = 'images/slides/misc_diner.jpg'
arrSlides_D[2] = 'images/slides/almosthome02.jpg'
arrSlides_D[3] = 'images/slides/riskreward02.jpg'
arrSlides_D[4] = 'images/slides/almosthome01.jpg'
arrSlides_D[5] = 'images/slides/lourdes01.jpg'
arrSlides_D[6] = 'images/slides/kismet01.jpg'



// ===========================================================
// SLIDE SELECTION FUNCTION
// ===========================================================

function setSlides(){
	// slideID = Math.round( (arrayImageCount-1) * randomnumber) + 1 ;
	slideID = Math.floor((Math.random() * arrayImageCount));
	document.slide_A.src = arrSlides_A[slideID];
	document.slide_B.src = arrSlides_B[slideID];
	document.slide_C.src = arrSlides_C[slideID];
	document.slide_D.src = arrSlides_D[slideID];
}



// ===========================================================
// ROLLOVER MANAGEMENT
// ===========================================================


function addNavImg(id, src_on, src_off)
{
	arrNavImg[id] = {on: new Image(), off: new Image()};
	arrNavImg[id].on.src = src_on;
	arrNavImg[id].off.src = src_off;
}

function changeNavImg(id, isOn, swapVal)
{
	document.getElementById(id).src = isOn ? arrNavImg[swapVal].on.src : arrNavImg[swapVal].off.src;
}


function newImage(arg) {
	if (document.images) {
		newImg = new Image();
		newImg.src = arg;
		return newImg;
	}
}

function swapImage() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<swapImage.arguments.length; i+=2) {
			document[swapImage.arguments[i]].src = swapImage.arguments[i+1];
		}
	}
}



function preloadImagesHome() {
	if (document.images) {
		addNavImg('0', 'images/home_nav_profile_rollover.gif', 'images/home_nav_profile.gif');
		addNavImg('1', 'images/home_nav_films_rollover.gif', 'images/home_nav_films.gif');
		addNavImg('2', 'images/home_nav_cinemat_rollover.gif', 'images/home_nav_cinemat.gif');
		addNavImg('3', 'images/home_nav_nonprofit_rollover.gif', 'images/home_nav_nonprofit.gif');
		addNavImg('4', 'images/home_nav_awards_rollover.gif', 'images/home_nav_awards.gif');
		addNavImg('5', 'images/home_nav_teaching_rollover.gif', 'images/home_nav_teaching.gif');
		addNavImg('6', 'images/header_contact_home_rollover.gif', 'images/header_contact_home.gif');

		setSlides();

		preloadFlag = true;
	}
}

function preloadImagesGeneral() {
	if (document.images) {
		addNavImg('0', 'images/nav_profile_rollover.gif', 'images/nav_profile.gif');
		addNavImg('1', 'images/nav_films_rollover.gif', 'images/nav_films.gif');
		addNavImg('2', 'images/nav_cinematography_rollover.gif', 'images/nav_cinematography.gif');
		addNavImg('3', 'images/nav_nonprofit_rollover.gif', 'images/nav_nonprofit.gif');
		addNavImg('4', 'images/nav_awards_rollover.gif', 'images/nav_awards.gif');
		addNavImg('5', 'images/nav_teaching_rollover.gif', 'images/nav_teaching.gif');
		addNavImg('6', 'images/header_contact_rollover.gif', 'images/header_contact.gif');

		preloadFlag = true;
	}
}

function preloadImagesFilms() {
	if (document.images) {
		addNavImg('0', 'images/nav_profile_rollover.gif', 'images/nav_profile.gif');
		addNavImg('1', 'images/nav_films_rollover.gif', 'images/nav_films.gif');
		addNavImg('2', 'images/nav_cinematography_rollover.gif', 'images/nav_cinematography.gif');
		addNavImg('3', 'images/nav_nonprofit_rollover.gif', 'images/nav_nonprofit.gif');
		addNavImg('4', 'images/nav_awards_rollover.gif', 'images/nav_awards.gif');
		addNavImg('5', 'images/nav_teaching_rollover.gif', 'images/nav_teaching.gif');
		addNavImg('6', 'images/header_contact_rollover.gif', 'images/header_contact.gif');

		addNavImg('7', 'images/films_sdogs_sublink_rollover.gif', 'images/films_sdogs_sublink.gif');
		addNavImg('8', 'images/films_sublink_details_rollover.gif', 'images/films_sublink_details.gif');
		addNavImg('9', 'images/films_sublink_stills_rollover.gif', 'images/films_sublink_stills.gif');

		preloadFlag = true;
	}
}