// JavaScript Document

function open_close(menu_id) {
	var linkname = menu_id + "_link";

	if (document.getElementById(menu_id).className == "closed") {
		document.getElementById(menu_id).className = "open";
		document.getElementById(linkname).firstChild.nodeValue = "-";
	} else {
		document.getElementById(menu_id).className = "closed";
		document.getElementById(linkname).firstChild.nodeValue = "+";
	}
}