sudo a user without password

[Jozsi Avadkan]

Hi

On a Desktop machine, running Debian Lenny [GNOME], i just want to put
a .desktop icon on the desktop, so that i can easy launch apps with
other users [e.g. not so trusted programs..maybe this way i could get a
little more secure.. :) ].

#########################################
$ cat Dude.desktop
[Desktop Entry]
Version=1.0
Encoding=UTF-8
Name=Dude
Type=Application
Terminal=false
Icon=gnome-mines
Exec=gksu -u dude-user wine "/home/dude-user/.wine/drive_c/Program
Files/Dude/dude.exe"
GenericName=Dude
#########################################

But every time [in a new session] i want to launch "Dude" with wine,
with another user...i have to type in his password.



-The question-
How can i set the sudoers file, so that it doesnt prompt for a password?

E.g.: I have a user named "someone".
On the "someone" users Desktop, I have the "Dude.desktop" file.
The Dude user [who has this program installed] is "dude-user"

I already tried [with visudo]:

someone    dude-user=(ALL) ALL

but it don't seems to work [still need password when launching
"Dude.desktop"]. Is there any way [I have to log out or something?]?

Thank you!

sorry for posting it to the Ubuntu Mailing list :\