function changeImage(id, fileName)
{
	var imgs = document.getElementById(id).getElementsByTagName("img");
	for (var i=0; i<imgs.length; i++)
	{
		if (imgs[i].src.indexOf(fileName) > -1)
			imgs[i].style.display = "block";
		else
			imgs[i].style.display = "none";
	}
}