an easy way to do it would be through a script i would think ...
to go down
RNFR default.asp
RNTO default.main
RNFR default.down
RNTO default.asp
to go back up
RNFR default.asp
RNTO default.down
RNFR default.main
RNTO default.asp
just add it to ur commands
or play around with it to get it to work with dynamic filenames using %f