var numberOfImages = 5;
var currentImage = 1;
var ImageRotateTimeoutSeconds = 12;
var ImageTimeoutId = null;
ImageRotateTimeout = ImageRotateTimeoutSeconds*400; 

function Imagenext() {
	currentImage++;
	if (currentImage >numberOfImages) {
		currentImage = 1;
	}
	Imagenav(currentImage);
}

function Imageprev() {
	currentImage--;
	if (currentImage <1) {
		currentImage = numberOfImages;
	}
	Imagenav(currentImage);
}			

function Imagenav(showitem) {
	if (ImageTimeoutId != null) {
		window.clearTimeout(ImageTimeoutId);
	}
	if (showitem > numberOfImages) {
		showitem = numberOfImages;
	}
	currentImage = showitem;
	for (var i=1;i<=numberOfImages;i++) {
		obj = "Image_"+i+"";
		itemobj = document.getElementById(obj);
		if (itemobj == null) {
			numberOfImages = i-1;
			if (showitem > numberOfImages) {
				Imagenav(numberOfImages);
			}			
			break;
		}
		else if (i == showitem) {
			itemobj.className='Image_show';
		}
		else {
			itemobj.className='Image_hidden';
		}
	}
	setImageTimeout();
}

function setImageTimeout() {
	ImageTimeoutId = window.setTimeout("Imagenext()",ImageRotateTimeout);
}

setImageTimeout();