Preloader and a script.

i know that its nothing like this site, but there are several people here with other experiences as well.

My issue:

I have a HTML page, and was wondering if someone knew how to create a preloader? A loader that tells when the page is fully loaded, so that my visitors don't have to wait... (i have a lot of small pictures).

Thanks.
By the way:
Anyone know how to create a script which makes me able to link to next page i a serie of pages, without having a link on each page?

Example:
page 1 Page 1
page 2 text......................................................
page 3 ...........................................................
page 4

next (clicking this takes u to page 2)
previous