Help renaming files

I have a series of log files with names like 'Nov9-21:30' on a Sun machine that I need to FTP to my Windows machine. Windows can't deal with the : in the file name so I would like to rename all the files to change the :'s to -'s . How do I change the one character in all the filenames?

Thanks

to be save, go to sun in that dir, make a sub dir (say aaa)
for file in `ls *:*`
do FILE=`echo $file | sed 's/:/-/g'`
cp $file aaa/$FILE
done
the cp will preserve your original files, making a copy in aaa
so: abc:123 will result in aaa/abc-123
then go to that-dir/subdir and using ftp: 'mget *'

Perfect. Worked like a charm.
Thank you.