Просто функции

function ge(el) {
    return isElement(el) ? el : document.getElementById(el);
}

function $(q, el) {
    return (el || document).querySelector(q);
}

function $$(q, el) {
    return (el || document).querySelectorAll(q);
}

function clone(o) {
    if (o == null || typeof o != 'object') {
        return o;
    }
    var copy = o.constructor();
    for (var i in o) {
        copy[i] = clone(o[i]);
    }
    return copy;
}

function isElement(o) {
    return o instanceof HTMLElement;
}

function isArray(o) {
    return o instanceof Array;
}

function isObject(o) {
    return o === Object(o);
}

function val(el, v) {
    el = ge(el);
    var i = /^(INPUT|TEXTAREA)$/.test(e.tagName) ? 'value': 'innerHTML';
    return arguments.length > 1 ? el[i] = v : el[i];
}

function rand(min, max) {
    return Math.floor(Math.random() * (max - min + 1) + min);
}

function shuffle(a) {
    for(var i = 0, e = a.length - 1, r, v; i <= e; ++i) {
        r = rand(0, e);
        v = a[r];
        a[r] = a[i];
        a[i] = v;
    }
    return a;
}

function choice(a) {
    return a[rand(0, a.length - 1)];
}

function strRepeat(s, n) {
    return Array(++n).join(s);
}

function strPad(s, len, pad, direction) {
    if (s.length < len) {
        len = len - s.length;
        pad = typeof pad == 'number' || pad ? pad + '' : ' ';
        direction = direction ? direction.toLowerCase() : 'left';
        if (direction == 'both') {
            return strPad('', Math.floor(len / 2), pad) +
                s + strPad('', Math.ceil(len / 2), pad, 'right');
        }
        pad = strRepeat(pad, Math.ceil(len / pad.length)).substr(0, len);
        s = direction == 'right' ? s + pad : pad + s;
    }
    return s;
}

function strRev(s) {
    return s.split(/|/).reverse().join('');
}

/* ----------------------------( 80 chars line )----------------------------- */

function escapeHtml(s) {
    return s.replace(/[<>&"]/g, function (i) {
        return '&' + {'<': 'lt', '>': 'gt', '&': 'amp', '"': 'quot'}[i] + ';';
    })
}

function escapePattern(s) {
    return s.replace(/([.\\\/+*?[^\]$(){}=!<>|:-])/g, '\\$1');
}

var ajax = new Function;

ajax.getReq = function (m, u, cb) {
    var r = new XMLHttpRequest;
    r.open(m, u);
    r.onload = function () {
        typeof cb == 'function' && cb(r);
    };
    r.setRequestHeader('X-Requested-With', 'XMLHttpRequest');
    return r;
};

ajax.get = function (u, cb) {
    var r = this.getReq('GET', u, cb);
    r.send();
};

ajax.load = function (u, el) {
    this.get(u, function (r) {
        val(el, r.response);
    });
};

ajax.post = function (u, cb, params) {
    var r = this.getReq('POST', u, cb), q = '', i;
    r.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    for(i in params) {
        if (params.hasOwnProperty(i)) {
            q += (q.length ? '&': '') + i + '=' + encodeURIComponent(params[i]);
        }
    }
    r.send(q);
};

ajax.sendForm = function (el, cb) {
    el = ge(el);
    var r = this.getReq('POST', el.action, cb), fd = new FormData(el);
    r.send(fd);
};