[CentOS] downloadonly

Wed Dec 31 02:53:49 UTC 2008
Jerry Geis <geisj at pagestation.com>

Hi I am trying to grab some files with the command (as example)
yum -y install vnc --downloadonly --downloaddir=/tmp

but it says the file is already installed. I know that, but I want to 
download it anyway
and store it for later install on another machine (saving the download 
time later).

How do I tell yum to go ahead and download the file?