var allRentalImages = new Array();
var rentalImages = new Array();	
var rentalImageSeq = new Array();	

function changeNextImage(rentalSeq, imageSeq) {
	var newSeq = getNextImageSeq(rentalSeq, imageSeq);
	setImageUrl(rentalSeq, getImageUrl(rentalSeq, newSeq));
	//setImageTitle(rentalSeq, getImageTitle(rentalSeq, newSeq));
	rentalImageSeq[rentalSeq] = newSeq;
}
function changePreviousImage(rentalSeq, imageSeq) {
	var newSeq = getPreviousImageSeq(rentalSeq, imageSeq);
	setImageUrl(rentalSeq, getImageUrl(rentalSeq, newSeq));
	//setImageTitle(rentalSeq, getImageTitle(rentalSeq, newSeq));
	rentalImageSeq[rentalSeq] = newSeq;
}

function getNextImageSeq(rentalSeq, imageSeq) {
	var rentalImages  = allRentalImages[rentalSeq];
	var maxSeq = rentalImages.length-1;
	if ( maxSeq < 1 ) {
		return null;
	}
	if ( imageSeq >= maxSeq ) {
		return 1;
	}
	return imageSeq+1;
}
function getPreviousImageSeq(rentalSeq, imageSeq) {
	var rentalImages  = allRentalImages[rentalSeq];
	var maxSeq = rentalImages.length-1;
	if ( maxSeq < 1 ) {
		return null;
	}
	if ( imageSeq <= 1 ) {
		return maxSeq;
	}
	return imageSeq-1;
}

function getImage(rentalSeq, imageSeq) {
	var tmpRentalImages = allRentalImages[rentalSeq];
	return tmpRentalImages[imageSeq];
}
function getImageUrl(rentalSeq, imageSeq) {
	return getImage(rentalSeq, imageSeq).url;
}
function getImageTitle(rentalSeq, imageSeq) {
	return getImage(rentalSeq, imageSeq).title;
}
function setImageUrl(rentalSeq, url ) {
	document.getElementById('image'+rentalSeq).src = url;
	return;
}
function setImageTitle(rentalSeq, title ) {
	document.getElementById('title'+rentalSeq).value = title;
	return;
}