var i = 0;			

var tune_slide = new Array('tune-1', 'tune-2', 'tune-3', 'tune-4', 'tune-5', 'tune-6', 'tune-7', 'tune-8', 'tune-9', 'tune-10', 'tune-11', 'tune-12', 'tune-13', 'tune-14', 'tune-15', 'tune-16', 'tune-17', 'tune-18', 'tune-19');
var NumOfImages = tune_slide.length;
var wait = 4000;

function SwapImage(x,y) {		
	$(tune_slide[x]).appear({ duration: 1.5 });
	$(tune_slide[y]).fade({duration: 1.5});
}

function StartSlideShow() {
	play = setInterval('Play()',wait);
								
}

function Play() {
	var imageShow, imageHide;

	imageShow = i+1;
	imageHide = i;
	
	if (imageShow == NumOfImages) {
		SwapImage(0,imageHide);	
		i = 0;					
	} else {
		SwapImage(imageShow,imageHide);			
		i++;
	}
}

function GoNext() {
	clearInterval(play);
	
	var imageShow, imageHide;

	imageShow = i+1;
	imageHide = i;
	
	if (imageShow == NumOfImages) {
		SwapImage(0,imageHide);	
		i = 0;					
	} else {
		SwapImage(imageShow,imageHide);			
		i++;
	}
	StartSlideShow();
}

function GoPrevious() {
	clearInterval(play);

	var imageShow, imageHide;
				
	imageShow = i-1;
	imageHide = i;
	
	if (i == 0) {
		SwapImage(NumOfImages-1,imageHide);	
		i = NumOfImages-1;		
	} else {
		SwapImage(imageShow,imageHide);			
		i--;
	}
	StartSlideShow();
}