How do you build "classes" in JavaScript?

[CompiledMonkey]

I've generally built a JavaScript file for each "class" I want to build. So, each class would look something like:

Person.js

function Person()
{
    var self = this;

    // variables
    this.XmlRequestPerson;

    // methods
    this.loginPerson = loginPerson;

    function loginPerson(userName, password)
    {
        // do some stuff!
    }
}

Having a class like this gives me the opportunity to do something like:

var person = new Person();
person.loginPerson("sup", "dude");

Are there better ways to do this? It just seems like the "var self = this" thing is stupid, because inside the Person.js file I have to reference everything local by "self" instead of "this". Thoughts??

[Vali]

That's the OO way of coding, usseful when you want to make sure the variables used will not be messed with by other code that other people might add on your pages.

[CompiledMonkey]

Any other ways, maybe better ways, to do this?