var ajax = false;


if (window.XMLHttpRequest) {

	ajax = new XMLHttpRequest();
	
} else if (window.ActiveXObject) {
	try {
		ajax = new ActiveXObject("Msxml2.XMLHTTP");
	} catch (e1) { 
		try {
			ajax = new ActiveXObject("Microsoft.XMLHTTP");
		} catch (e2) { }
	}
	
}

if (!ajax) {
	alert ('Some page functionality is unavailable.');
}