attaching cardstock to painted walls - help!

[http://users.livejournal.com/_cooling/]

i know i've read something about attaching paper to painted walls previously, and i believe it was in this community but i wasn't able to find it in the memories. my boyfriend and i would like to hang these [after they're all cut out + line up as one complete image] on the painted walls of our apartment. our concern is attaching it so that it won't destroy the walls. we were thinking about attaching the pages to something [posterboard, foamcore, etc] before hanging it but aren't sure what would be best/easiest. any suggestions would be greatly appreciated.