// Script 13.2 - 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:
	ajax = new XMLHttpRequest();
	
} else if (window.ActiveXObject) { // Older IE browsers

	// Create type Msxml2.XMLHTTP, if possible:
	try {
		ajax = new ActiveXObject("Msxml2.XMLHTTP");
	} catch (e1) { // Create the older type instead:
		try {
			ajax = new ActiveXObject("Microsoft.XMLHTTP");
		} catch (e2) { }
	}
	
}

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

//------------- Create XHR ---------------
	var XHR2 = false;

// Create the object...

	// Choose object type based upon what's supported:
	if (window.XMLHttpRequest) {
	
		// IE 7, Mozilla, Safari, Firefox, Opera, most browsers:
		XHR2 = new XMLHttpRequest();
		
	} else if (window.ActiveXObject) { // Older IE browsers
	
		// Create type Msxml2.XMLHTTP, if possible:
		try {
			XHR2 = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e1) { // Create the older type instead:
			try {
				XHR2 = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e2) { }
		}
		
	}
	
	// Send an alert if the object wasn't created.
	if (!XHR2) {
		alert ('Some page functionality is unavailable.');
	}
	
	//------------- Create XHR ---------------
	var XHR1 = false;

// Create the object...

	// Choose object type based upon what's supported:
	if (window.XMLHttpRequest) {
	
		// IE 7, Mozilla, Safari, Firefox, Opera, most browsers:
		XHR1 = new XMLHttpRequest();
		
	} else if (window.ActiveXObject) { // Older IE browsers
	
		// Create type Msxml2.XMLHTTP, if possible:
		try {
			XHR1 = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e1) { // Create the older type instead:
			try {
				XHR1 = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e2) { }
		}
		
	}
	
	// Send an alert if the object wasn't created.
	if (!XHR1) {
		alert ('Some page functionality is unavailable.');
	}