Photoshop :: Scripting A Position

Using action script I would like to crate a text layer and have it be bottom right justified on the canvas. The problem is that when you create a text layer you must click on the canvas. Since I have different size canvases I am doing this on and I want to do it automatically there is an obstacle.

If I could just create the layer and then some how tell it to position itself that would work too. When you script all moves are relative from the starting position.