<?php
sleep(1);
if(!empty($_GET))
{
    echo "GET\n";
    print_r($_GET);
}
elseif(!empty($_POST))
{
    echo "POST\n";
    print_r($_POST);
}
?>
<script language="JavaScript">
function okey()
{
 
 var request = new XMLHttpRequest();
 var postSend = 'name=' + name + '&surname=' + surname;

 request.open('POST', 'index.php', true);
 request.onreadystatechange = function() 
 {
    if (request.readyState == 4) 
    { 
	if (request.status == 200)
            alert(request.responseText);
    }
    //Вобще чтобы что-нибудь вывело
    else
        alert();
 
 }			
 request.send(postSend);

}
</script>
<form action="" method="post">
Name:
<br/>
<input type="text" name="name"/>
<br/>
Surname:
<br/>
<input type="text" name="surname"/>
<input type="button" name="Go" value="Ok" onclick="okey();"/>
</form>

document.getElementById("div").innerHTML = request.responseText;