If you are loading in a .jpg or .swf into an existing
movieclip and you want that new object to be at a specific location
then just give that location to the movieclip that you're loading
into. Any new .jpg or .swf that's loaded in will be positioned
based on it's upper left corner. This upper left corner is the
registration point for this new object. The registration point will
be positioned to the registration point of the movieclip that its
loaded in to.
This is why you're seeing the new content loaded "down right.
You can give the movieclip a new _x and _y value which will give
the loaded content a new position on the stage.
If you want to change the size of the loaded content, then
you can set a new _width and/or _height value for that