javascript kao Objektno Orjentisan jezik, osnove

Code:
// JavaScript Document
var IFrameDropDown = {
    topLeftX : "0px",
    topLeftY : "0px",
    width : "100px",
    height : "200px",
    url : "mvm.php",
    inputField : Object,
    init :     function()
            {
                this.inputField = document.getElementById("whiteplayer");
                this.addEvents(this.inputField, "change");
            },
    addEvents : function(obj, e)
                {
                    if(window.addEventListener){ // Mozilla, Netscape, Firefox
                        obj.addEventListener(e, this.alerter, false);
                    } else { // IE
                        obj.attachEvent("on" + e, this.alerter);
                    }
                },
    alerter :function()
                {
                    alert("sdf");
                },
    setTopLeftX:function(x)
                {
                    this.topLeftX = x + "px";
                },
    setTopLeftY:function(y)
                {
                    this.topLeftY = y + "px";
                }
};
window.onload = IFrameDropDown.init;

Code:

function IFrameDropDown() {
    this.topLeftX = "0px";
    this.topLeftY = "0px";
    this.width = "100px";
    this.height = "200px";
    this.url = "mvm.php";
    this.inputField = Object;

    this.init  = function() {
         this.inputField = document.getElementById("whiteplayer");
         this.addEvents(this.inputField, "change");
    };
    this.addEvents = function(obj, e) {
         if(window.addEventListener){ // Mozilla, Netscape, Firefox
             obj.addEventListener(e, this.alerter, false);
         } else { // IE
             obj.attachEvent("on" + e, this.alerter);
         }
    };
    this.alerter = function() {
         alert("sdf");
    };
    this.setTopLeftX = function(x) {
         this.topLeftX = x + "px";
    };
    this.setTopLeftY = function(y) {
          this.topLeftY = y + "px";
    };
};

var iframedd = new IFrameDropDown;
window.onload = function() {
     iframedd.init();
}

Code:
// JavaScript Document
var IFrameDropDown = {
    topLeftX : "0px",
    topLeftY : "0px",
    width : "100px",
    height : "200px",
    url : "mvm.php",
    inputField : Object,
    addEvents : function (obj, e)
                {
                    if(window.addEventListener){ // Mozilla, Netscape, Firefox
                        obj.addEventListener(e, this.alerter, false);
                    } else { // IE
                        obj.attachEvent("on" + e, this.alerter);
                    }
                },
    alerter :function ()
                {
                    alert("sdf");
                },
    init :     function ()
            {
                alert(this);
                this.inputField = document.getElementById("whiteplayer");
                this.addEvents(this.inputField, "change");
            },
    setTopLeftX:function (x)
                {
                    this.topLeftX = x + "px";
                },
    setTopLeftY:function (y)
                {
                    this.topLeftY = y + "px";
                }
};
function pageLoader() {
    IFrameDropDown.init();
}

window.onload = pageLoader;