function showDetail(DivId) {
//背景
  var bgObj=document.getElementById("bgDiv");
  bgObj.style.width = document.body.offsetWidth + "px";
  bgObj.style.height = screen.height + "px";

//定义窗口
  var msgObj=document.getElementById("msgDiv");
  msgObj.style.marginTop = -75 +  document.documentElement.scrollTop + "px";

//关闭
  document.getElementById("msgShut").onclick = function(){
  bgObj.style.display = msgObj.style.display = "none";
  }
  msgObj.style.display = bgObj.style.display = "block";
  document.getElementById("msgDetail").innerHTML=document.getElementById(DivId).innerHTML;
}