function getXhr() {
	if(window.XMLHttpRequest)
		axhr = new XMLHttpRequest();
	else if(window.ActiveXObject) {
		try {
			axhr = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			axhr = new ActiveXObject("Microsoft.XMLHTTP");
		}
	} else {
		alert("XMLHTTPRequest not supported");
		axhr = false;
	}
        return axhr;
}