Binary XHR

function loadBinary(url){
    var xhr = (typeof ActiveXObject == "function") ?
        new ActiveXObject("Msxml2.XmlHttp.6.0") :
        new XMLHttpRequest();

    xhr.open("GET",url,false);

    if(typeof typeof xhr.overrideMimeType == "function")
        xhr.overrideMimeType("text/plain; charset=x-user-defined");

    xhr.send(null);

    if(xhr.status != 200) return "";

    return (typeof xhr.responseBinary == "function") ?
        xhr.responseBinary :
        xhr.responseText;
}