// --- 获取ClassName
document.getElementsByClassName = function(cl) {
	var retnode = [];
	var myclass = new RegExp('\\b'+cl+'\\b');
	var elem = this.getElementsByTagName('*');
	for (var j = 0; j < elem.length; j++) {
		var classes = elem[j].className;
		if (myclass.test(classes)) retnode.push(elem[j]);
	}
	return retnode;
}

// --- 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");
	}
	document.getElementById(show_item).style.display = "block";
	var items = document.getElementsByClassName("title");
	for (var j=0; j<items.length; j++) {
		items[j].onclick = function() {
			var o = document.getElementById("opt_" + this.name);
			if (o.style.display != "block") {
				HideAll();
				o.style.display = "block";
				setCookie("show_item",this.name);
			}
			else {
				o.style.display = "none";
			}
		}
	}
}

// --- 设置网页高度
function SameH(left,menubox,mainbox){
var a=document.getElementById(left);
var b=document.getElementById(menubox);
var c=document.getElementById(mainbox);

	
	if (b.scrollHeight < c.scrollHeight){
		a.style.height = b.style.height = c.scrollHeight;
	}
	if (c.scrollHeight < 620){
		a.style.height 	= 610	
		b.style.height 	= 610	
		c.style.height 	= 610
	}
}