function getXMLHttp() {
    var XMLHttp = null;
    if (window.XMLHttpRequest) {
	try {
	    XMLHttp = new XMLHttpRequest();
	} catch (e) { }
    }
    else{
	if (window.ActiveXObject) {
	    try {
		XMLHttp = new ActiveXObject("Msxml2.XMLHTTP");
	    } catch (e) {
		try {
		    XMLHttp = new ActiveXObject("Microsoft.XMLHTTP");
		} catch (e) { }
	    }
	}
    }
    return XMLHttp;
}
	
var XMLHttp = getXMLHttp();