function getAjax() {
  var ajaxRequest;
	
	try {
		// Opera 8.0+, Firefox, Safari
		ajaxRequest = new XMLHttpRequest();
	} catch (e) {
		// Internet Explorer Browsers
		try {
			ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e){
				alert("Votre navigateur ne supporte pas AJAX - Your browser does not support AJAX");
				return false;
			}
		}
	}
  return ajaxRequest;
}