var curImg = 1;
var autoSwitch = true;

setInterval(function() 
{
if (autoSwitch == true)
{
  alternateImage();
}
}, 4000);

function alternateImage()
{
setCurrentImage((curImg % 3) + 1);
 
}

function setCurrentImage(img)
{
  $('#slideshow-image' + curImg).fadeOut(1000);
  $('#slideshow-control' + curImg).animate({opacity: 0.5}, 400);
  curImg = img;
  $('#slideshow-image' + curImg).fadeIn(1000);
  $('#slideshow-control' + curImg).animate({opacity: 1}, 400);
   
}

function slideshowSwitch(img)
{
	autoSwitch = false;
	setCurrentImage(img);
}