var currentImage = 1;
var nextImg;
var previousImg;
var numTextblockImg = 0;

function setButtons(){
	if (currentImage == 1){
		previousImg = numImages;
		//currentImage = 1;
		nextImg = 2;
	}
	else if (currentImage == numImages){
		//currentImage = numImages;
		nextImg = 1;
		previousImg = numImages - 1;
	}
	else{
		//currentImage = currentImage;
		previousImg = currentImage - 1;
		nextImg = currentImage + 1;
	}
}
function previous(num){
	if (num == 1){
		num = numImages;
	}
	else{
		num--;
	}
	return num;
}
function next(num){
	if (num == numImages){
		num = 1;
	}
	else{
		num++;
	}
	return num;
}

function previousImage(){
	setButtons();
	//alert(currentImage);
	if (document.getElementById("bigPortraitPhoto")){
		document.getElementById("bigPortraitPhoto").src = eval(currentPage + "_" + category + previousImg + ".src");
	}
		currentImage = previous(currentImage);
	return;
}

function nextImage(){
	setButtons();
	//alert(currentImage);
	if (document.getElementById("bigPortraitPhoto")){
		document.getElementById("bigPortraitPhoto").src = eval(currentPage + "_" + category + nextImg + ".src");
	}
		currentImage = next(currentImage);
	return;
}

function showTextBlock(){
	if (document.getElementById("textblockImg")){
		//alert(eval(currentPage + "_textblock_"+ numTextblockImg + ".src"));
		document.getElementById("textblockImg").src = eval(currentPage + "_textblock_"+ numTextblockImg + ".src");
	}
}