== Automatic mount at boot ==
Add these lines to your fstab and create the file to hold your credentials, so that they are not readable by everyone.
=== /etc/fstab ===
//10.1.2.3/public /mnt/public cifs credentials=/root/cred.smb 0 0
//10.1.2.4/mp3 /mnt/mp3 cifs credentials=/root/cred.smb 0 0
=== /root/cred.smb ===
username=mr
password=l33tp4ssw0rd
== Mount on demand ==
=== /etc/fstab ===
//10.1.2.3/public /mnt/public cifs noauto,user,username=gh 0 0
//10.1.2.4/mp3 /mnt/mp3 cifs noauto,user,username=gh 0 0