No necesitás nada de eso, sólo trabajar prolijamente. Un ejemplo:
Código PHP:
<?php if(isset($_POST['test']))die($_POST['test']); ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Documento sin título</title>
<script>
function http(){
if(typeof window.XMLHttpRequest!='undefined'){
return new XMLHttpRequest();
}else{
try{
return new ActiveXObject('Microsoft.XMLHTTP');
}catch(e){
alert('Su navegador no soporta AJAX');
return false;
}
}
}
function request(url,callback,params){
var H=new http();
if(!H)return;
H.open('post',url+'?'+Math.random(),true);
H.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
H.onreadystatechange=function(){
if(H.readyState==4){
callback(H.responseText);
H.onreadystatechange=function(){}
H.abort();
H=null;
}
}
var p='';
for(var i in params){
p+='&'+i+'='+escape(params[i]);
}
H.send(p);
}
function c(v,id){
document.getElementById(id).innerHTML=v;
}
onload=function(){
request('<?php echo basename($_SERVER['PHP_SELF']) ?>',function(v){c(v,'d1');},{'test':'valor 1'});
request('<?php echo basename($_SERVER['PHP_SELF']) ?>',function(v){c(v,'d2');},{'test':'valor 2'});
request('<?php echo basename($_SERVER['PHP_SELF']) ?>',function(v){c(v,'d3');},{'test':'valor 3'});
request('<?php echo basename($_SERVER['PHP_SELF']) ?>',function(v){c(v,'d4');},{'test':'valor 4'});
request('<?php echo basename($_SERVER['PHP_SELF']) ?>',function(v){c(v,'d5');},{'test':'valor 5'});
}
</script>
</head>
<body>
<div id="d1"></div>
<div id="d2"></div>
<div id="d3"></div>
<div id="d4"></div>
<div id="d5"></div>
</body>
</html>