Comment 2 for bug 207116

I mean that, if you click somewhere one the page, a cursur will apear there. Then pressing pageup will scroll the page so that the cursor is at the bottom of the page and you can't scroll up highter with page up, same with page down in reversed direction. I guess by dfefault the cursor is at the top of the page that's why pageup pagedozn send you at the top. (sorry for my poor english)