function showImage(image) {
	var images = getElementsByClassName('showableImage');
	for (var i = 0; i < images.length; i++)
		images[i].style.display = 'none';
		
	document.getElementById(image).style.display = 'inline';
}

function getElementsByClassName(searchClass, node, tag) {
	var elements = new Array();
	
	if (node == null || tag.length ==0)
		node = document;
		
	if (tag == null || tag.length == 0)
		tag = '*';
		
	var elementsByTagName = node.getElementsByTagName(tag);
	var pattern = new RegExp("(^|\\s)"+searchClass+"(\\s|$)");
	for (i = 0, j = 0; i < elementsByTagName.length; i++) {
		if (pattern.test(elementsByTagName[i].className)) {
			elements[j] = elementsByTagName[i];
			j++;
		}
	}
	
	return elements;
}