function showHide(id)
{
	var el = document.getElementById(id);
	var bExpand = true;
	var images = el.getElementsByTagName("img");
	if (images[0].src.indexOf("minus.gif")!=-1) {
		bExpand = false;
		images[0].src = "images/plus.gif";
	} else {
		images[0].src = "images/minus.gif";
	}
	var subs = el.lastChild;
	if (bExpand)
		subs.style.display = "block";
	else
		subs.style.display = "none";
}