var photoDiv;
var photoImg;

function setPhotoTarget(divName) {
	try {
		photoDiv = document.getElementById(divName);
		photoImg = photoDiv.getElementsByTagName("img");

	} catch(e) {
		photoDiv = null;
		photoImg = null;
	}
}

function switchPhoto(imgElement) {

	setPhotoOverView(imgElement.src);

}

function setPhotoOverView(src) {

	if(!photoDiv !== null) {

		photoImg[0].src = src;

	}
}