// JavaScript Document
function getXMLHttpRequestObject(){
		var xhr = false;

		if (window.XMLHttpRequest) { // Mozilla, Safari,...
				xhr = new XMLHttpRequest();
				if (xhr.overrideMimeType) {
						xhr.overrideMimeType('text/xml');
				}
		} else if (window.ActiveXObject) { // IE
				try {
						xhr = new ActiveXObject("Msxml2.XMLHTTP");
				} catch (e) {
						try {
								xhr = new ActiveXObject("Microsoft.XMLHTTP");
						} catch (e) {}
				}
		}

		if (!xhr) {
				alert('Abandon :( Impossible de créer une instance XMLHTTP');
				return false;
		}
		return xhr;
}