A new project of mine is using full screen background images.

After I read some articles on the web, I still had some technical questions..

- for people with low internet speed, it seems better to give low quality jpg's (..%) than low resolution (..px on ..px) picture. As I have the impression that when the browser scales quality drops far quicker.
- Should I precut some images according to the most common screen ratio's? like 16:10, 16:9, 4:3, 5:4?
-- or can I group some ratios?

Thats it,
Hope that you all could assist me on this one..