function X()
{
    this.y = 5;
}

function X()
{
}

X.prototype.y = 5;

function X()
{
    var y = 5;
}

window.onload = function()
{
    var reqObject = null;
    
    if (typeof XMLHttpRequest != 'undefined') {
        reqObject = new XMLHttpRequest();
    } else {
        try {
            reqObject = new ActiveXObject("Msxml2.XMLHTTP");
        } catch(e) {
            try {
                reqObject = new ActiveXObject("Microsoft.XMLHTTP");
            } catch(e) {
                return;
            }
        }
    }
    
    reqObject.open('GET', 'test.txt', true);
    
    var readyStateChange = {
        sender : reqObject,
        
        doAction : function()
        {
            if (this.sender.readyState == 4) {
                alert(this.sender.responseText);
            }
        }
    };
    
    reqObject.onreadystatechange = function()
    {
        readyStateChange.doAction();
    };
    
    reqObject.send(null);
};

var MyObject = [];
MyObject.myMethod = function() {
}
//
var MyObject = function() {
  this.myMethod = function() {
  }
}
// 
var MyObject = new function() {
}