var request = false;
try {
  request = new XMLHttpRequest();
} catch (trymicrosoft) {
  try {
    request = new ActiveXObject("Msxml2.XMLHTTP");
  } catch (othermicrosoft) {
    try {
      request = new ActiveXObject("Microsoft.XMLHTTP");
    } catch (failed) {
      request = false;
    }
  }
}

if (!request)
  alert("Error initializing XMLHttpRequest!");
function pic(sid)
{
  var s=sid;
  if(s==1)
  {
    img1.src="images/xinwen.jpg";
	img2.src="images/yao_wen_z.jpg"
	img3.src="images/hanye_z.jpg"
	xinwen1.style.display='block';
	xinwen2.style.display='none';
	xinwen3.style.display='none';
  }
  if(s==2)
  {
    img2.src="images/yao_wen.jpg";
	img1.src="images/xinwen_z.jpg";
	img3.src="images/hanye_z.jpg";
	xinwen2.style.display='block';
	xinwen1.style.display='none';
	xinwen3.style.display='none';
  }
  if(s==3)
  {
    img1.src="images/xinwen_z.jpg";
	img2.src="images/yao_wen_z.jpg";
	img3.src="images/hanye.jpg";
	xinwen3.style.display='block';
	xinwen2.style.display='none';
	xinwen1.style.display='none';
  }
 // var url="ajax.asp?title="+s;
 //request.open("get",url,true);
 //// request.onreadystatechange=sc;
  //request.send(null);
 } 
 //function sc()
 //{
 //  if(request.readystate==4)
 //  {
// var xinwen=document.getElementById("xinwen");
 //    xinwen.innerHTML=request.responsetext;
//	 
  // }
// }