what is up with the space you put between the opening parenthesis and the first parameter?
It's really ugly IMO. If you're going to do that, atleast put a space between the last parameter and the closing parenthesis.
Also, I forgot about this before, but because you are setting the image of the NPC you can use the 'this.width' and 'this.height' variables to get the width/height instead of using getImgWidth()/getImgHeight()