Fix pagetools display without images FS#2634

This makes the pagetools in non-hover/static/active-mode use another
image replacement technique that falls back to the text when images are
disabled. Furthermore this fixes the :focused-display in IE7 by using
:active, too.
Use "old" image replacement for pagetools in IE7

This fixes the image display in IE7 with the disadvantage that now in
IE7 with images disabled the text won't be displayed anymore.
Merge pull request #191 from splitbrain/FS2634

Fix page tools display with images disabled FS#2634