var request = null;

function newRequest() {
	try {
		request = new XMLHttpRequest(); // Non microsoft browser
	} catch (tryMostMicrosoftBrowsers) {
		try {
			request = new ActiveXObject("Msxml2.XMLHTTP"); // Most ie versions
		} catch (otherMicrosoftBrowser) {
			try {
				request = new ActiveXObject("Microsoft.XMLHTTP"); // Other ie versions
			} catch (failure) {
				request = null;
			}
		}
	}
	if (request == null) {
		alert("Fehler beim erstellen des Anfrage-Objekts!");
	}
}