dojo.xhrGet Not Sending any Data - php

Question

I want to take dojo Get data from ajax to php
Dojo passing parameter i couldn't take it in php class.
passing the cpa is not pass to php file..
This is my code :
globalHandlers: {
doVsatEvents: function(vsatId, network, cpa) {
// retrieve the events via xml
dojo.xhrGet ({
url: "includes/vsat_events.php?",
handleAs: "xml",
preventCache: true,
content: {
network: network,
cpa: cpa
},
load: function(response, args) {
var temp = response.getElementsByTagName("event");
var eventsItems =[];
alert (temp.length);
for (var i = 0; i < temp.length; i++) {
var event = [];
event = [];
event['id'] = temp[i].getAttribute(['id']);
event['nms'] = temp[i].getAttribute(['nms']);
event['status'] = temp[i].getAttribute(['status']);
event['date'] = temp[i].getAttribute(["date"]);
event['time'] = temp[i].getAttribute(["time"]);
event['description'] = temp[i].getAttribute(["description"]);
alert (events['description']);
eventsItems.push(event);
}
var eventsGridData = {
identifier: 'id',
items: eventsItems
};
// build a floating pane
var fPane = SM.util.skymapFloatingPane("Events", "eventsFPID_" + SM.getNextId());
var eventsStore = new dojo.data.ItemFileReadStore({
data: eventsGridData,
clearOnClose: true
});
// set the layout structure: 720px
// scrollbar is 14px wide
var eventsLayout = [{
field: 'id',
name: 'ID',
width: '60px'
},{
field: 'nms',
name: 'NMS',
width: '55px'
},{
field: 'status',
name: 'Severity',
width: '60px'
},{
field: 'date',
name: 'Date',
width: '100px'
},{
field: 'time',
name: 'Time',
width: '90px'
},{
field: 'description',
name: 'Description',
width: '400px'
}];
// create a new grid:
var eventsGrid = new dojox.grid.DataGrid({
query: {
id: '*'
},
store: eventsStore,
clientSort: true,
rowSelector: '20px',
structure: eventsLayout
}, document.createElement('div'));
// append the new grid to the div "gridContainer4":
fPane.set('content', eventsGrid);
//document.body.appendChild(fPane.domNode);
fPane.startup();
fPane.show();
}
});
},
This is my PHP code :
<?php
chdir('../../../');
include_once("./include/auth.php");
// Start XML file, create parent node
$doc = new DOMDocument;
$node = $doc->createElement("events");
$parnode = $doc->appendChild($node);
$query = "SELECT * FROM `skymap_1_nms_events`";
$query .= " WHERE `cpa` = ".$_GET['cpa'];
$query .= " ORDER BY `id` DESC";
//print $query;
$result = mysql_query ($query);
header("Content-type: text/xml");
while($row = mysql_fetch_assoc($result)){
$status = $row['severity'];
if ($status == 3){
$status = "normal";
} elseif($status == 1) {
$status = "disabled";
} elseif($status == 2) {
$status = "unmanaged";
} elseif($status == 4) {
$status = "warning";
} elseif($status == 5) {
$status = "minor";
} elseif($status == 6) {
$status = "major";
} elseif($status == 7) {
$status = "critical";
} else {
$status = "unknown";
}
$childnode = $doc->createElement("event");
$newnode = $parnode->appendChild($childnode);
$newnode->setAttribute("id", $row['id']);
$newnode->setAttribute("nms", $row['reporting_nms']);
$newnode->setAttribute("status", $status);
$newnode->setAttribute("date", $row['date']);
$newnode->setAttribute("time", $row['time']);
$newnode->setAttribute("description", $row['description']);
}
$xmlfile = $doc->saveXML();
echo $xmlfile;
?>
any help?