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var xmlReq;

function sendRequest(url, params, HttpMethod){

if(!HttpMethod) {
HttpMethod=”POST”;
}

xmlReq=startXMLHTTPRequest();

if(xmlReq) {

xmlReq.onreadystatechange=onReadyState;
xmlReq.open(HttpMethod,url,true);
xmlReq.send(params);
}
}

function startXMLHTTPRequest(){

var req=null;

try {
req=new ActiveXObject(”Microsoft.XMLHTTP”);
}
catch(e)
{
req=new XMLHttpRequest()
}

return req;

}

function onReadyState()
{
var readyXML=xmlReq.readyState;
var data=null;

if(readyXML == 4){
if(xmlReq.status == 200) {
console.innerHTML=”;
data=xmlReq.responseText;
}
else {
data=xmlReq.status;
}
}
else{
console.innerHTML=”;

if(readyXML == 3){
data=”Serving …”;
}
if(readyXML == 2){
data=”Loading …”;
}
if(readyXML == 1){
data=”Sending …”;
}
}

dataInnerHTML(data);
}

function dataInnerHTML(data){

if(data!=null){
var newline=document.createElement(”div”);
console.appendChild(newline);
newline.innerHTML+=”"+data+”";
}

}

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function startup() {
    setInterval("pinger('live',0)",10000);
    setInterval("pinger('standby',1)",10000);
    setInterval("pinger('dev',2)",10000);
    /*setInterval("pinger('test1',3)",10000);
    setInterval("pinger('test2',4)",10000);
    setInterval("pinger('test3',5)",10000);
    setInterval("pinger('test4',6)",10000);
    */
}

function pinger(server,divit) {
    var data = new Object();
    data.console=document.getElementById('ping_div' + divit);
    data.console.innerHTML="";
    sendRequest("http://www.google.com", undefined, undefined, data);
}


function sendRequest(url, params, HttpMethod, data){
    if(!HttpMethod) {
        HttpMethod="POST";
    }

    var xmlReq=startXMLHTTPRequest();

    if(xmlReq) {
        xmlReq.onreadystatechange=function(){onReadyState(xmlReq, data)}
        xmlReq.open(HttpMethod,url,true);
        xmlReq.send(params);
    }
}

function startXMLHTTPRequest(){
    var req=null;
    
    try {
        req=new ActiveXObject("Microsoft.XMLHTTP");
    }catch(e){
        req=new XMLHttpRequest()
    }
    
    return req;
}

function onReadyState(xmlReq, data){
    
    switch (xmlReq.readyState){
        case 4:
            if(xmlReq.status == 200) {
                console.innerHTML="";
                data.txt=xmlReq.responseText;
            }else {
                data.txt=xmlReq.status;
            }
            break;
        case 3:
            data.txt="Serving …";
            break;
        case 2:
            data.txt="Loading …";
        case 1:
            data.txt="Sending …";
    }
    
    dataInnerHTML(data);
}

function dataInnerHTML(data){
    if(data!=null && data.txt!=null){
        var newline=document.createElement("div");
        data.console.appendChild(newline);
        newline.innerHTML+=""+data.txt+"";
    }
}

Html snippet

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<!-- Import jQuery -->
<script src="http://jquery.com/src/jquery-latest.js" type="text/javascript"></script>  

<div id="ping_div_live"></div>
<div id="ping_div_standby"></div>

Javascript part

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// Untested code, but hopefully you get the idea
function startup() {
  ping('live',    10000);
  ping('standby', 10000);
  // ...
}

function ping(hostname, interval) {
  setInterval(function() { do_ajax_ping(hostname); }, interval);
}

function do_ajax_ping(hostname) {
  // Using the jQuery AJAX method here, makes this easy
  $.ajax({
      type: "GET",
      url: "../php/ping_sys2.php?target=" + hostname,
      processData: false,

      // Using a closure to be called on success here
      success: function(data) {  
        // jQuery DOM manipulation. Again..easier like this.
        $("#ping_div_" + hostname).append("<div>" + data + "</div>");
      }
   });
}

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