// JavaScript Document
function getHTTPObject(){
        if(window.XMLHttpRequest){
                return new XMLHttpRequest();
        }else if(window.ActiveXObject){
                var prefixes = ["MSXML2", "Microsoft", "MSXML", "MSXML3"];
                for(var i = 0; i < prefixes.length; i++){
                        try     {
                                return new ActiveXObject(prefixes[i] + ".XMLHTTP");
                        } catch (e) {}
                }
        }
}
var xmlRequest = getHTTPObject();