// --- 隐藏所有
function HideAll() {
	var items = document.getElementsByClassName("optiton");
	for (var j=0; j<items.length; j++) {
		items[j].style.display = "none";
	}
}
// --- 设置cookie
function setCookie(sName,sValue,expireHours) {
	var cookieString = sName + "=" + escape(sValue);
	//;判断是否设置过期时间
	if (expireHours>0) {
		 var date = new Date();
		 date.setTime(date.getTime + expireHours * 3600 * 1000);
		 cookieString = cookieString + "; expire=" + date.toGMTString();
	}
	document.cookie = cookieString;
}
//--- 获取cookie
function getCookie(sName) {
  var aCookie = document.cookie.split("; ");
  for (var j=0; j < aCookie.length; j++){
	var aCrumb = aCookie[j].split("=");
	if (escape(sName) == aCrumb[0])
	  return unescape(aCrumb[1]);
  }
  return null;
}
window.onload = function() {
	var show_item = "opt_1";
	if (getCookie("show_item") != null) {
		 show_item= "opt_" + getCookie("show_item");
	} 
	var obj = document.getElementById(show_item);
	if (obj != null)
		obj.style.display = "block"; 
	 
}

function onclickmenu(obj)
{
	var o = document.getElementById("opt_" + obj.name);
	if (o.style.display != "block") {
		HideAll();
		o.style.display = "block";
		setCookie("show_item", obj.name);
	}
	else {
		o.style.display = "none";
	}
}