function getByClass(oParent, sClass){
    var aResult=[];
    var aEle=oParent.getElementsByTagName('*');
    
    for(var i=0; i<aEle.length; i++){
        if(aEle[i].className==sClass){
            aResult.push(aEle[i]);
        }
    }
    return aResult;
};

window.onload=function(){
  //切换图片
  var oDivT2=document.getElementById('_easyui_tree_2');
  var oUlTLines=oDivT2.nextElementSibling || oDivT2.nextSibling;
  var oLiNan=oUlTLines.children[0];
  var aSpanNan=getByClass(oLiNan,'tree-title');
  var oLiPu=oUlTLines.children[1];
  var aSpanPu=getByClass(oLiPu,'tree-title');
  var oDivRC=document.getElementById('rightCon');
  var oImgNan=oDivRC.getElementsByTagName('img')[0];
  var oImgPu=oDivRC.getElementsByTagName('img')[1];

  for(var i=0;i<aSpanPu.length;i++){
    aSpanPu[i].onclick=function(){
      oImgNan.style.display='none';
      oImgPu.style.display='block';

      var sTxtPu=this.innerText || this.textContent;

      window.status=sTxtPu;
    };
  };

  for(var j=0;j<aSpanNan.length;j++){
    aSpanNan[j].onclick=function(){
      oImgPu.style.display='none';
      oImgNan.style.display='block';

      var sTxtNan=this.innerText || this.textContent;

      window.status=sTxtNan;
    };
  };
};