I have numerous times reorganized my partitions so maybe I can help... in the example I move /home to /usr (I suppose your hda1 is / and hda5 is /usr ?). NOTE the -a switch for "cp" is required, it makes sure symbolic links etc. work correctly even in the new place.
su
# First create a new homedir
mkdir /usr/home
# Copy all files from /home to the new place
cp -a /home/* /usr/home/
# Move old home out of the way
mv /home /oldhome
# Link new homedir to /home
ln -s /usr/home /home
That should do it. "cp -a" has newer let me down, and God knows I've used it a lot