Image sizing problem Uhhh!

[sheila123]

Yesterday I was told that my images were too large (100-200KB)
So I followed the tutorials and resized everything.

I have my images as:
image.jpg (uploaded into main image folder)
image_med.jpg (uploaded into med folder)
image_lrg.jpg (uploaded into large folder)

Very first change to my site after this, and this is what I got:

The product is small, that's fine. But clicking to make larger? Nope, won't do it.
Clicking second picture further down? Same thing. Small.

What am I doing wrong? Uhhhhh!

NOTE: Here is my unchanged files from yesterday....here
As you can see, the pink salts in the main product pic enlarges nicely.
The two pics below don't.