The large JPEG photos from my camera are really too big for display on my web pages so I would like to know the best way to re size them in one fell swoop. Can that be done with the HTML Editor or should that be done beforehand with a third party program?

Generally resizing before is best as it cuts down on web load times... if you don't have a third party software already GIMP is good and of course http://www.coffeecup.com/pixconverter/

http://pixlr.com/editor

Is another place you can try.

Easy Thumbnails works very well

http://www.fookes.com/downloads.php?product=ezthumbs