var xmlHttp;
var oo;
var url;
var ImgSrc = new Array();//图片地址
var ImgAlt = new Array();//鼠标放上去显示的文字
var ImgHerf =  new Array();//链接
var step=0;
var cs=0;

function createXMLHttpRequest()
{
  try {
    xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
   } catch (e) {
     try {
        xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
     } catch (E) {
        xmlHttp=false;
     }
  }
if (!xmlHttp&& typeof XMLHttpRequest!='undefined') {
        try {
                xmlHttp= new XMLHttpRequest();
        } catch (e) {
                xmlHttp=false;
        }
}
if (!xmlHttp&& window.createRequest) {
        try {
                xmlHttp= window.createRequest();
        } catch (e) {
                xmlHttp=false;
        }
}
  return xmlHttp;
}


function startRequest(o,a){
  oo=o;
  var url="/common/readurltp.php?url="+a;
  createXMLHttpRequest();
  xmlHttp.open("POST",url,true);
  xmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
  xmlHttp.onreadystatechange=handleStateChange;
  xmlHttp.send("id="+a);
}

function handleStateChange(){
  var tpurl=new Array();
  if(xmlHttp.readyState==4){
    if(xmlHttp.status==200){
      var results=xmlHttp.responseXML;
      var ps=results.getElementsByTagName("tpurl");
      ImgSrc=Array();
      for(var i=0;i<ps.length;i++){
        ImgSrc[i]=ps[i].firstChild.nodeValue;
      }
    if(oo.zhi>=ps.length) oo.zhi=0;
    oo.src=ImgSrc[oo.zhi];
    for (var i=0;i<ImgSrc.length;i++){(new Image()).src = ImgSrc[i];}
    oo.zhi++;
    }
  }

}


function stop(){
 if(typeof(timer)!="undefined") clearInterval(timer);
}