var temp, temp2, cookieArray, cookieArray2, cookieCount;
function initiate(){

  cookieCount=0;

  if(document.cookie){
    cookieArray=document.cookie.split(";");
    cookieArray2=new Array();

    for(i in cookieArray){
      cookieArray2[cookieArray[i].split("=")[0].replace(/ /g,"")]=cookieArray[i].split("=")[1].replace(/ /g,"");
    }

  }

  cookieArray=(document.cookie.indexOf("yihuaCookie=")>=0)?cookieArray2["yihuaCookie"].split(","):new Array();

  temp=document.getElementById("containerul");
　　//遍历containerul下的所有li
  for(var o=0;o<temp.getElementsByTagName("li").length;o++){
　　//如果该li下包含有ul，说明包含有子分类
    if(temp.getElementsByTagName("li")[o].getElementsByTagName("ul").length>0){
    
      temp2				= document.createElement("span");
      temp2.className			= "symbols";
      temp2.style.backgroundImage	= (cookieArray.length>0)?((cookieArray[cookieCount]=="true")?"url(/ShowTree/show.gif)":"url(/ShowTree/hide.gif)"):"url(/ShowTree/hide.gif)";
      temp2.onclick=function(){
        showhide(this.parentNode);//控制显示或隐藏
        writeCookie();
      }


      temp.getElementsByTagName("li")[o].insertBefore(temp2,temp.getElementsByTagName("li")[o].firstChild)

      temp.getElementsByTagName("li")[o].getElementsByTagName("ul")[0].style.display = "none";

      if(cookieArray[cookieCount]=="true"){
        showhide(temp.getElementsByTagName("li")[o]);
      }

      cookieCount++;

    }
    else{

      temp2				= document.createElement("span");
      temp2.className			= "symbols";
      temp2.style.backgroundImage	= "url(/ShowTree/page.gif)";

      temp.getElementsByTagName("li")[o].insertBefore(temp2,temp.getElementsByTagName("li")[o].firstChild);

    }

  }

}

function showhide(el){
//控制显示或隐藏
  el.getElementsByTagName("ul")[0].style.display=(el.getElementsByTagName("ul")[0].style.display=="block")?"none":"block";
//控制背景图片
  el.getElementsByTagName("span")[0].style.backgroundImage=(el.getElementsByTagName("ul")[0].style.display=="block")?"url(/ShowTree/show.gif)":"url(/ShowTree/hide.gif)";

}

function writeCookie(){		
  cookieArray=new Array()

  for(var q=0;q<temp.getElementsByTagName("li").length;q++){

    if(temp.getElementsByTagName("li")[q].childNodes.length>0){
      if(temp.getElementsByTagName("li")[q].childNodes[0].nodeName=="SPAN" && temp.getElementsByTagName("li")[q].getElementsByTagName("ul").length>0){

        cookieArray[cookieArray.length]=(temp.getElementsByTagName("li")[q].getElementsByTagName("ul")[0].style.display=="block");

      }
    }

  }

  document.cookie="yihuaCookie="+cookieArray.join(",")+";expires="+new Date(new Date().getTime() + 365*24*60*60*1000).toGMTString();

}