Javascript functions objects

Hi,

Can anyone explain why this is?

functions can be declared in the constructor or in the prototype or on the object after the object has been initialised.

functions can not be declared on the object previous to initialisation, it is not available after iniaialisation.

e.g.

var Person = function () {
this.ctx = 'this is some other stuff'; // Public ;
var stuff = 'this is some stuff'; // Private

this.getThisSuff = function () { // this works
return stuff;
};
};

Person.getMyOtherStuff = function () { // this doesnt work

return (function () {return this.ctx;})();

};

Person.prototype.getMyStuff = function () { // this works

return this.ctx;
};


Person.StuffHolder = 'more stuff'; // this works


var p = new Person();

alert('1 ' + p.getThisSuff()); // works

alert('2 ' + p.getMyStuff()); // works

alert('3 ' + p.getMyOtherStuff()); // dont work, why so?