hijack.js

Object.prototype.hijack = function(f) {
  var o = this;

  for(k in o) {
    (function(key) {
      if(o[key] instanceof Function) {
        var t = o[key].clone();
        o[key] = function() {
          return f(o, key, t, arguments);
        }
      }
    })(k);
  }
};


Function.prototype.clone = function() {
    var that = this;
    var temp = function temporary() { return that.apply(this, arguments); };
    for(var key in this) {
        if (this.hasOwnProperty(key)) {
            temp[key] = this[key];
        }
    }
    return temp;
};