//当该方法被调用时交换指定图片的来源及指定节点的样式！
var FrontCommonContent_showTree = {
  alternate : function(id, index) {
    var imgObj = document.getElementById(id + "_img" + index);
    if(imgObj != null) {
      if(imgObj.src.indexOf("click_right") > -1) {
        imgObj.src = imgObj.src.replace("click_right", "click_down");
      }
      else {
        if(imgObj.src.indexOf("click_down") > -1) {
          imgObj.src = imgObj.src.replace("click_down", "click_right");
        }
      }
    }

    var ulObj = document.getElementById(id + "_ul" + index);
    if(ulObj != null) {
      if(ulObj.className == "navH") {
        ulObj.className = "navS";
      }
      else {
        if(ulObj.className == "navS") {
          ulObj.className = "navH";
        }
      }
    }
  }
}