// ajax.js

/* This page creates an Ajax request object.
 * This page is included by other pages that
 * need to perform an XMLHttpRequest.
 */

// Initialize the object:
var ajax = false;

// Create the object...

// Choose object type based upon what's supported:
if (window.XMLHttpRequest) {
		
	// IE 7, Mozilla, Safari, Firefox, Opera, most browsers:
	try {
		ajax = new XMLHttpRequest();
	} catch (e1) {
		ajax = false;
	}
		
} else if (window.ActiveXObject) { // Older IE browsers

	// Create type Msxml2.XMLHTTP, if possible:
	try {
		ajax = new ActiveXObject("Msxml2.XMLHTTP");
	} catch (e2) { // Create the older type instead:
		try {
			ajax = new ActiveXObject("Microsoft.XMLHTTP");
		} catch (e3) {
			ajax = false;
		}
	}
	
}

// Send an alert if the object wasn't created.
if (!ajax) {
	alert ('Some page functionality is unavailable.');
}