// ajax.js

/*	This page defines a function for creating an Ajax request object.
 *	This page should be included by other pages that 
 *	need to perform an XMLHttpRequest.
 */
 
/*	Function for creating the XMLHttpRequest object.
 *	Function takes no arguments.
 *	Function returns a browser-specific XMLHttpRequest object
 *	or returns the Boolean value false.
 */

function getXMLHttpRequestObject()
	{
		// Initialize the object:
		var Ajax = false;
		// 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 (e)
					{ // Create the older type instead:
						try
							{
								Ajax = new ActiveXObject("Microsoft.XMLHTTP");
							}
						catch (e) {}
					}
			} // End of main IF-ELSE IF.
		// Return the value:
		return Ajax;
	} // End of getXMLHttpRequestObject() function.