Script Summary: Puts a line after the previous end of page if you PageDown for the last page in the document.
When I scroll text using PageDown, the last page always troubles me since I have to search for the previous bottom of the page.
This script puts a line in after the end of the previous page so you don't need to scan the page trying to find where you should continue reading.
The mark is removed after a second, but if you use NoScript, then timeout does not work (anybody knows how to set it?). In this case you can press any key to remove the mark.
