function $(ID) {
	return document.getElementById(ID);
}

function swapMainImage(thumbNail) {
	var mainImage = $('mainImage');
	var mainImageCaption = $('mainImageCaption');
	var thumbSrc = thumbNail.src;
	var mainSrc = thumbSrc.replace('/thumbs', '');
	var links = $('gallery').getElementsByTagName('a');
		
	mainImage.src = thumbSrc;
	mainImageCaption.innerHTML = thumbNail.title;
	mainImage.src = mainSrc;
	return false;
}