var currentImageNum = 0

function nextImage() {
	if (currentImageNum < photoFileNames.length - 1) {
		currentImageNum++
	} else {
		currentImageNum = 0
	}
	document.getElementById("tourImage").src = photoFileNames[currentImageNum]
	document.getElementById("imageNum").innerHTML = currentImageNum + 1
	document.getElementById("photoTitle").innerHTML = photoTitles[currentImageNum]
	document.getElementById("photoDesc").innerHTML = photoDescriptions[currentImageNum]
	document.getElementById("photoDesc").scrollTop = 0
}

function prevImage() {
		if (currentImageNum > 0) {
			currentImageNum--
		} else {
			currentImageNum = photoFileNames.length - 1
		}
	document.getElementById("tourImage").src = photoFileNames[currentImageNum]
	document.getElementById("imageNum").innerHTML = currentImageNum + 1
	document.getElementById("photoTitle").innerHTML = photoTitles[currentImageNum]
	document.getElementById("photoDesc").innerHTML = photoDescriptions[currentImageNum]
	document.getElementById("photoDesc").scrollTop = 0
}