var curImg = 0;
var curSnurra = 0;	

function bytSnurra(visa){
	//alert("visa: " + visa + "; tabort: " + curSnurra);
	var snurra = "snurra";
	
	if (visa!=curSnurra) {
		document.getElementById(snurra + visa).style.display = 'block';
		
		if (curSnurra != 0) {
			document.getElementById(snurra + curSnurra).style.display = 'none';
		}		
		
		document.getElementById("curPage").innerHTML = visa;
		curSnurra = visa;
	}
}

function swapImg(visa) {
	//alert("visa: " + visa + "; tabort: " + curImg);

	var bigGalImg = "bigGalImg";
	var bigGalTxt = "bigGalTxt";
	var thumbImg = "thumb";
			
	if (visa!=curImg) {
		document.getElementById(bigGalImg + visa).style.display = 'inline';		
		document.getElementById(bigGalTxt + visa).style.display = 'block';
		//document.getElementById(thumbImg + visa).style.outline = '2px solid #262626';
		
		if (curImg != 0) {
			document.getElementById(bigGalImg + curImg).style.display = 'none';
			document.getElementById(bigGalTxt + curImg).style.display = 'none';	
			//document.getElementById(thumbImg + curImg).style.outline = '0';
		}
		
		curImg = visa;
	}
}


function nextImg(imgs, imgsInv) {
	var curImgI, newImgI, newSnurra;

	//get index of curImg
	curImgI = imgsInv[curImg];
	
	//if curImg is last image swap image to first image
	if (curImgI == imgs.length - 1) {
		newImgI = 0;
	} else { // else swap image to next image in list
		newImgI = curImgI + 1;		
	}	
	
		
	newSnurra = Math.floor(newImgI / 8) + 1;
	

	
	swapImg(imgs[newImgI]);		
	bytSnurra(newSnurra);
}

function prevImg(imgs, imgsInv) {
	var curImgI, newImgI, newSnurra;

	//get index of curImg
	curImgI = imgsInv[curImg];
	
	//if curImg is first image swap image to last image
	if (curImgI == 0) {	
		newImgI = imgs.length - 1;		
	} else { // else swap image to next image in list
		newImgI = curImgI - 1;
	}	
	
	newSnurra = Math.floor(newImgI / 8) + 1;
	
	swapImg(imgs[newImgI]);
	bytSnurra(newSnurra);
}