Hi ycarry,

PutOnGround command is here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=5427.13

CenterAtOrigin command is here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=2409.2

Instructions for installing a plug-in are here:
http://moi3d.com/wiki/FAQ#Q:_How_do_I_install_a_plug-in_script.3F

- Michael