ajax lo hace con el objeto http request aqui te voy dar la funcion ajax que uso siempre esta super sencilla y agrega mi correo es
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function ajax(){
try {
req = new XMLHttpRequest();
} catch(err1) {
try {
req = new ActiveXObject("Msxml2.XMLHTTP");
} catch (err2) {
try {
req = new ActiveXObject("Microsoft.XMLHTTP");
} catch (err3) {
req = false;
}
}
}
return req;
}
var http= ajax();
function leerajaxconpost(etiqueta,url,et)
{
var fechas= new Date();
var urlradox=url+"?rand="+fechas.getTime();
http.open("POST",urlradox,true);
http.onreadystatechange=function() { estado(et);};
http.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
http.send(etiqueta);
}
function leerajaxconget(querry,url,et)
{
var fechas= new Date();
var urlradox=url+"?rand="+fechas.getTime()+"&lugar="+q uerry;
http.open("GET",urlradox,true);
http.onreadystatechange=function(){estado(et);};
http.send(null);
}
function estado( etig)
{
if(http.readyState==4)
{
if(http.status==200)
{
document.getElementById(etig).innerHTML=http.respo nseText;
}
}
else
{
document.getElementById(etig).innerHTML="<center>< object classid=\"clsid:d27cdb6e-ae6d-11cf-96b8-444553540000\" codebase=\"http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=9,0,0,0\" width=\"70\" height=\"90\" id=\"login\" align=\"middle\"><param name=\"allowScriptAccess\" value=\"sameDomain\" /><param name=\"allowFullScreen\" value=\"false\" /> <param name=\"movie\" value=\"login.swf\" /><param name=\"quality\" value=\"high\" /><param name=\"bgcolor\" value=\"#ffffff\" /> <embed src=\"login.swf\" quality=\"high\" bgcolor=\"#ffffff \" width=\"70\" height=\"90\" name=\"login\" align=\"middle\" allowScriptAccess=\"sameDomain\" allowFullScreen=\"false\" type=\"application/x-shockwave-flash\" pluginspage=\"http://www.macromedia.com/go/getflashplayer\" /></object></center>";
}
}