I have a question here..i having a problem with mandrake samba.

I want user to log in username/password each time user(windows) click on the samba server in network .The current situation i am having now is each user can click and access the
Samba server without any username /passwd. But only prompt out the dialog box uname/pwd during accessing the folder..

Any idea how to make a dialog uname/passwd prompt during user(windows)first time click on the samba server icon on network