function toggle(name) {
	var imageObject;
	
	//Netscape-specific code for layers--second arg is assumed to be parent layer name
	if (document.layers && arguments.length == 2) {
		imageObject = eval("document."+arguments[1]+".document."+name);
	}
	else
		imageObject = document.images[name];

	imageSource = imageObject.src;
	var underscoreIndex = imageSource.lastIndexOf("_");
	var dotIndex = imageSource.lastIndexOf(".");
	var toggleCode = imageSource.slice(underscoreIndex + 1, dotIndex);
	toggleCode = (toggleCode == "off" ? "on" : "off");
	
	imageObject.src = imageSource.slice(0, underscoreIndex + 1) + toggleCode + ".gif";
}