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/** This is a list of XMLHttpRequest creation factory functions to try*/
XHRfactories = [
    function() { return new XMLHttpRequest(); },
    function() { return new ActiveXObject("Msxml2.XMLHTTP"); },
    function() { return new ActiveXObject("Microsoft.XMLHTTP"); }
];
 
/** When we find a factory that works, store it here*/
XHRfactory = null;
 
function XHRnewRequest() {
    if (XHRfactory !== null) {
    	return XHRfactory();
    }
 
    for(var i = 0; i < XHRfactories.length; i++) {
        try {
            var factory = XHRfactories[i];
            var request = factory();
            if (request !== null) {
                XHRfactory = factory;
                return request;
            }
        }
        catch(e) {
            continue;
        }
    }
 
    // If we get here, none of the factory candidates succeeded,
    // so throw an exception now and for all future calls.
    XHRfactory = function() {
        throw new Error("XMLHttpRequest not supported");
    };
    XHRfactory(); // Throw an error
} | 
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