I'm programming my website and I wanted to create different css for different resolutions.
I've done this by following the tutorial up there: <http://css-tricks.com/resolution-specific-stylesheets/>

Everything done correctly, but when my window resizes for the narrow css, all images are big. 

1 Question: How can I resize them in the css?
2 Question: If I don't want to show some div in the narrow style, using "display: none;" will block it from loading or it just hide it?

Thanks a lot and sorry for my bad english.