Call PHP webservices with Ajax

[2mk]

I create web services with php, but i need to access it using Ajax. Anyone can help me ?

This my simple web services :

<?php
include('nusoap.php');
$server= new soap_server;
$server->register('LoginPresenter');

//Login Presenter
function LoginPresenter($user_mail, $user_password)
{
if(!$user_mail or !$user_password)
{
return new soap_fault(
'Client', '',
'Parameter anda tidak lengkap', ''
);
}else
{
........................
return $user;
}
}
$server->service($HTTP_RAW_POST_DATA);

exit();
?>