var prevImage;
var prevImageSrc;
var clickedImage;
var clickedImageSrc;
function switchImage( image, newImage, grouped ){
	if( image != null ){
		if( grouped ){
			if( clickedImage != null && clickedImage != image )
				switchImage( clickedImage, clickedImageSrc );

			clickedImage = image;
			clickedImageSrc = document.images[image].src.replace(/_F2/g,'');
		}else{
			prevImageSrc = document.images[image].src;
			document.images[image].src = newImage;
		}

    prevImage = image;
	}else if( clickedImage != prevImage ) document.images[prevImage].src = prevImageSrc;
}

function preLoadArray( imageArray ) {
	for(i=0;i<imageArray.length; i++) {
		newImg = new Image();
		newImg.src = imageArray[i];
		document.images[document.images.length] = newImg;
	}
}

function preLoadImages() {
	if( document.images ) {
		images = preLoadImages.arguments;
		ln = images.length;
		for( i=0; i<ln; i++ ) {
			newImg = new Image();
			if(images[0].constructor == Array) { //preload passed array
				preLoadArray(images[i]);
			} else {
				newImg.src = images[i];
				document.images[document.images.length] = newImg;
			}
		}
	}
}

function imageErrorHandler() {}