function Sarissa(){};
Sarissa.IS_ENABLED_XMLHTTP = false;
var _SARISSA_IS_IE = document.all && window.ActiveXObject && navigator.userAgent.toLowerCase().indexOf("msie") > -1  && navigator.userAgent.toLowerCase().indexOf("opera") == -1;

if(_SARISSA_IS_IE){
    var _SARISSA_XMLHTTP_PROGID = "";
    pickRecentProgID = function (idList, enabledList){
        var bFound = false;
        for(var i=0; i < idList.length && !bFound; i++){
            try{
                var oDoc = new ActiveXObject(idList[i]);
                o2Store = idList[i];
                bFound = true;
                for(var j=0;j<enabledList.length;j++)
                    if(i <= enabledList[j][1])
                        Sarissa["IS_ENABLED_"+enabledList[j][0]] = true;
            }catch (objException){
                // trap; try next progID
            };
        };
        if (!bFound)
            throw "Could not retreive a valid progID of Class: " + idList[idList.length-1]+". (original exception: "+e+")";
        idList = null;
        return o2Store;
    };
    _SARISSA_XMLHTTP_PROGID = pickRecentProgID(["Msxml2.XMLHTTP.5.0", "Msxml2.XMLHTTP.4.0", "MSXML2.XMLHTTP.3.0", "MSXML2.XMLHTTP", "Microsoft.XMLHTTP"], [["XMLHTTP", 4]]);
    pickRecentProgID = null;
}

if(window.XMLHttpRequest){
    Sarissa.IS_ENABLED_XMLHTTP = true;
} else if(_SARISSA_IS_IE){
    XMLHttpRequest = function() {
        return new ActiveXObject(_SARISSA_XMLHTTP_PROGID);
    };
    Sarissa.IS_ENABLED_XMLHTTP = true;
};