Rakeshweb.com

An average Googler would probably spend some time navigating through pages in Google, but not anymore, thanks to Google Auto Pager and Google Image Auto Pager. These two are Greasemonkey script for firefox which saves you from the hassle of paging through search results. Google Auto Script automatically attach the next set of results of your queries to the bottom of the page. That means you don’t have to hit the next button after navigating to the end of the results.
Similarly, when you do a google images search and scroll down towards the bottom of search results, this script will seamlessly retrieve the next set of images, display them on the same page and rewrite all the links to point directly to origin images.

You can install the Google Auto pager and Google Images Auto Pager Userscript from
http://userscripts.org/scripts/source/8430.user.js and
http://userscripts.org/scripts/source/8433.user.js respectively.

And then to activate these script you just have to do a doubleclick anywhere on the page http://www.google.com and http://images.google.com, another doubleclick will turns off the script.