Replace in place?

 From:  Frenchy Pilou (PILOU) 13 Jan 2011  (8 of 17) 
3974.8 In reply to 3974.7 
No It's not that :)
See my previus post ;) http://moi3d.com/forum/index.php?webtag=MOI&msg=3974.6
I want replace all the blue cubes!