<script type="text/javascript">

var TEST = function(var1)
{
	this.myVar = var1;
}
TEST.prototype.myArray = {
	myParam : (this.myVar == "1") ? "1" : "2",

	myTest : function (){
		alert(this.myVar);
	}
}

// запускаем

var oTEST = new TEST("1");
oTEST.myArray.myTest();

</script>