function toggle(target)
{
	var hidable = document.getElementById(target + "_hidable");
	var img = document.getElementById(target + "_image");
	
	if (hidable.style.display == "none")
	{
		img.src = "images/minus.png";
		hidable.style.display = "inline";
	} else {
		img.src = "images/plus.png";
		hidable.style.display = "none";
	}
}