function fAjax() {

	if (window.XMLHttpRequest) {
		var vAjax = new XMLHttpRequest() ;     // Firefox, Safari, ...
	} else if (window.ActiveXObject) {
		var vAjax = new ActiveXObject("Microsoft.XMLHTTP");  // Internet Explorer
	}

	return vAjax ;

}

var vAjax = fAjax() ;