var xmlHttp;
var time = 8;

function createXMLHttpReqeust() {
xmlhttp=null;
if (window.XMLHttpRequest)
  {
  	xmlHttp=new XMLHttpRequest();
  }
else if (window.ActiveXObject)
  {
  xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
}

function doStart() {
    
    doPost();
}

function doPost() {
    createXMLHttpReqeust();
    xmlHttp.onreadystatechange = callback;
    var url = "get.php?timestamp=" + new Date().getTime();
    xmlHttp.open("GET", url, true);
    xmlHttp.setRequestHeader("charset","gb2312")
    xmlHttp.send(null);
    setTimeout("doPost()", "8000");
}

function callback() {
    if (xmlHttp.readyState == 4) {
        if (xmlHttp.status == 200) {
            parseResult();
        }
    }
}

function parseResult() {
    var show = document.getElementById("show");
    var data=xmlHttp.responseText;
    if (data != "Error" && data != "" && data.indexOf("Warning: socket_connect") == -1)
    	show.innerHTML = data;
}