how to create floating Web page?

Question

we have an image on the back and we can have content on the other layer just above it on the same page

Answer 1

Tarun, by floating, you mean one part scrolling and the others not? If yes, then check out this from ZinC:

For the background, use CSS:
body {
background-position: fixed;
}
If you want an object not to follow the rest of the page, also use CSS :) fixed positioning:
div {
position: fixed;
top: 0;
right: 0;
}