// Determine what is o.
function hoozit(o) {
    if (o.constructor === String) {
        return "string";
        
    } else if (o.constructor === Boolean) {
        return "boolean";

    } else if (o.constructor === Number) {

        if (isNaN(o)) {
            return "nan";
        } else {
            return "number";
        }

    } else if (typeof o === "undefined") {
        return "undefined";

    // consider: typeof null === object
    } else if (o === null) {
        return "null";

    // consider: typeof [] === object
    } else if (o instanceof Array) {
        return "array";
    
    // consider: typeof new Date() === object
    } else if (o instanceof Date) {
        return "date";

    // consider: /./ instanceof Object;
    //           /./ instanceof RegExp;
    //          typeof /./ === "function"; // => false in IE and Opera,
    //                                          true in FF and Safari
    } else if (o instanceof RegExp) {
        return "regexp";

    } else if (typeof o === "object") {
        return "object";

    } else if (o instanceof Function) {
        return "function";
    } else {
        return undefined;
    }
}

// Call the o related callback with the given arguments.
function bindCallbacks(o, callbacks, args) {
    var prop = hoozit(o);
    if (prop) {
        if (hoozit(callbacks[prop]) === "function") {
            return callbacks[prop].apply(callbacks, args);
        } else {
            return callbacks[prop]; // or undefined
        }
    }
}