do_shortcode with ajax method

hi
i’m loaded businessdirectiry plugins with the codex function do_shortcode in my wordpress page like this :

<?php
echo do_shortcode('[businessdirectory]');
?>

it run very well!
now i want to call it from a php page, map.php :

<?php
echo do_shortcode('[businessdirectory]');
?>

the map.php file is loaded when clicking on an input button on my wordpress page like this :

<script type="javascript">
function reload()
{
var xhr_object = new XMLHttpRequest();
xhr_object = new ActiveXObject("Msxml2.XMLHTTP");
xhr_object.open("GET", "https://localhost/test/map.php", false);
xhr_object.setRequestHeader("Content-Type","application/x-www-form-urlencoded; charset=utf-8");
xhr_object.send(null);
document.getElementById('result').innerHTML = xhr_object.responseText;
}
</script>
<form method="post" action="javascript:reload()" >
<input type="submit" name="btok" id="btok" value="OK" >
</form>
<div id='result'></div>

but nothing appending ! the div tag is empty !
have you another solution

thanks