two lines into one colon separated line...

Does anyone know how to get these two output lines into one colon ':' separated line with some unix command? Maybe nawk. I've tried to read the nawk and awk man pages but I don't get it right. Are these commands the one to use?

Output from find command:
#
/sw/tools/matlab/7.0.1/man
/sw/tools/gnat/5.01a/man
#

I would like to get it like this:

/sw/tools/matlab/7.0.1/man:/sw/tools/gnat/5.01a/man

Is awk the command to pipe the output to, and if so, how can I solve this?

Thanks to You that replys...

find ..... | tr '\n' ':'

or with nawk:
find ..... | nawk -v ORS=':' '1'

Great!! -Thanks... You saved my day.