Is this a valid AJAX call?

Hello,

In my last post i asked the same question badly/wrongly (http://www.experts-exchange.com/Programming/Languages/Scripting/AJAX/Q_23546727.html).

I'm trying to return the results of the following server-side query:
$query_regions_poi = mysql_query("SELECT * FROM locations WHERE reg_id = regions['id']");
while ($row=mysql_fetch_assoc($query_regions_poi)){
      echo '<poi_in_region poi_id="'.$row['id'].'" title="'.parseToXML($row['title']).'" date="'.$row['date'].'"/>';
}

...using an AJAX call so that i can display the results dynamically in my client-side code:

var regpoi = request.open("GET", "http://www.globexposure.net/includes/read.php?$poi_in_region=reg_id", true);
var html ='<div id="regional_poi">' + regpoi + '</div>';

I'm not sure that the line above is going to give the intended results. I'm trying to return all records from my locations mysql table where $reg_id (var reg_id = markers[i].getAttribute("reg_id");) is the same as the id of the current regional marker (var reg_id = markers[i].getAttribute("id");)

Many thanks for any adviceStart Free Trial