vpr-composer

initComposer = function() {
    if (window.XMLHttpRequest) {
        httpRequest = new XMLHttpRequest();
    } else if (window.ActiveXObject) {
        try {
            httpRequest = new ActiveXObject("Msxml2.XMLHTTP");
        }
        catch (e) {
            try {
                httpRequest = new activeXObject("Microsoft.XMLHTTP");
            }
            catch (e) {}
        }
    }
},

callComposer = function(url, eventHandler) {
    httpRequest.onreadystatechange = function() {
        if (httpRequest.readyState === 4 && httpRequest.status === 200) {
            eventHandler();
        }
    };

    httpRequest.open('GET', url());
    httpRequest.send();
},