Update: I don't recommend following the advice in this post. The 5-minute-ago version of my self was hatsy, arrogant, foolish and a bad dinner guest. I recommend the recently updated version of this post from the 1-minute-ago version of my self. He seems to be more well mannered and even keeled--I like him. However, if you're interested in what advice I used to be capable of delivering, please go on.
To do this, we didn't need 'this' or 'new', and we don't have to touch 'prototype' at all if we wanted to interpret 'arguments' differently (though Array.prototype.slice.apply is probably the most efficient way to do it).
This prototypical class model is, in my opinion, much easier to implement, read and debug than any of the blood, sweat and tear infused models suggested around the 'tubes.
As always, your mileage may vary.