var thumbLimit = 4;
var albumLimit = 12;
var imageDir = 'images/';
var curImg = 0;
var interval = 5000;
var threadPointer;
var running = true;

function initShow()
{
	switchMain();
	threadPointer = setInterval("next()",interval);
}

function switchPlay()
{
	if(running)
		pause();
	else
		play();
}

function pause()
{
	clearInterval(threadPointer);
	running = false;
}

function play()
{
	threadPointer = setInterval("next()",interval);
	running = true;
}

function update(index)
{
	curImg = parseInt(index.id.substring(1))+thumbStartIndex;
	switchMain();
}

function switchMain()
{
	var mainImag = document.getElementById('mainImg');
	mainImag.src = imageDir+curImg+'.jpg';
}




function next()
{
	if(curImg<albumLimit)
		curImg++;		
	else
		curImg=1;
	switchMain();
}

function previous()
{
	if(curImg>1)
		curImg--;
	else
		curImg = albumLimit;
	switchMain();
}