Comic Fury Webcomic Hosting - Image Sizing

Hey peoples, I've got more questions.

1) My sister tells me that the comic appears stretched (the image is elongated horizontally) when viewing it from her mac on chrome. When I view it in chrome on a PC it looks fine, so I have no idea what's wrong. At first I thought it was because I uploaded an image that was too large, but then I replaced it with an 800 pixel wide image (just like the upload thing says it requires), and she says she gets the same problem, just the image is smaller now.

2) I'm scanning the comic, which means I end up with a large pixel by pixel image. I don't like making the image so much smaller because then it loses quality. Is there a way to make the image resize based on browser width? With minimum and maximum resize options? (Maximum resize would be the original image, minimum would be what I judge to be the smallest legible size)

Huge thanks for any help!

1) different computers have different monitor resolutions. If she has a monitor that's less than 800 pixels wide, she probably has a netbook or something. That can happen. You'll either have to make the image even smaller or live with the fact that some people will have horizontal scrolling.

Also make sure she didn't zoom in on the page (which you can do by using CTRL + scroll wheel or + and -)

2) Yes, it is possible using CSS or some sort of javascript.

1) No, she's got a screen that's larger than mine, and the problem isn't that she has to scroll. The image is literally squashed, as in the dimensions are off, and I have no idea why.

2) Why wouldn't this be default implementation for the site? Meh. Guess I'll try to look up how to do it in css