I have a couple of questions regarding pictures used as back ground.

Dimensions of slides: 19.05 cm height 25.4 wide
My screen resolution: 1280 x 1024 pixels

1) I know that height to width proportion of my slide is not the same as the height to width proportion of my screen. Is that a problem. Should I set the proportion of my slides to the same proportion as me screen resolution? So that would be 19.05 x 23.81.

2) What happens when the presentation is viewed on a screen with a higher resolution if my pictures are only 1280 x 1024 and what do I do about it?

3) What happens when the presentation is viewed on a screen with a different proportion - wide screen for example and what do I do about it?

Many thanks for any answer.

Roligan