Scope issues with my Javascript object

[Soviut]

I'm having trouble getting the following code to work properly. Every time I try to access the private testing variable from the priveleged MyMethod it gives an error. Says it can't find testing and that it has no properties so I can't run a push() command on it.

function MyClass()
{
	var testing = new Array();

	// define the method
	function MyMethod()
	{
		this.testing.push("hello");
	}

	// make the method priveledged	
	this.MyMethod = MyMethod;
}

// a test function it ensure the variables declared here are isolated
function Start()
{
	var myClass = new MyClass();
	
	myClass.MyMethod();
	
	document.write("[" + myClass.testing + "]");
}

Start();