xmlhttprequest.js

function xhr(url, payload, method, headers){
    var x = new XMLHttpRequest();
    x.open(method, url, false);
    setRequestHeader(x, method, headers)
    x.send(payload);
    return x;
}

function axhr(url, payload, method, headers, responseType, callback){
    var x = new XMLHttpRequest();
    x.onload = function(){callback(x);}
    x.open(method, url);
    setRequestHeader(x, method, headers)
    x.responseType = responseType;
    x.send(payload);
}

function setRequestHeader(obj, method, headers){
    if(method === 'POST')
        obj.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    if(headers)
        for(name in headers)
            obj.setRequestHeader(name, headers[name]);
}

var xmlhttprequest = "\nxhr(url='', payload=null, method='GET', headers={});\naxhr(url='', payload=null, method='GET', headers={}, responseType='', callback);";