echo $DISPLAY                  # you'll be needing this value 3 lines below
sudo -i                        # or "su -" on older Slackwares
xauth merge ~alien/.Xauthority # use your own username here instead of "alien"
export DISPLAY=:0.0            # use the value of DISPLAY you've seen 3 lines before

Alternatively, you can run the following two commands which will give you the same end result:

sudo -s                        # a side effect of '-s' is that it allows root to run X programs
. /etc/profile                 # sourcing the global profile ensures
                               # that root has the ''sbin'' directories in the $PATH

   ##first type in:
    su

    ##after you hit enter you will see
    Password:         ##<----------- type in your root password here.

    ##Now you will see your prompt change from a $ to a # sign

    ##Don't worry, almost done now...

    ##type:

    ln -s /usr/lib/kde4/libexec/kdesu /usr/bin/kdesu

    ##hit enter, then type:
    exit

    ##You are now back to your regular user in your terminal. Lets test that puppy out!

    kdesu dolphin

    ##The normal kdesu dialog should pop up asking for roots password with the explanation that the program 
    ##dolphin needs root permissions. You can just cancel the dialog box since it was only a test to see if the link
    ##worked.

[global]
workgroup = workgroup
security = share
encrypt password = yes
smb passwd file = /etc/samba/smbpasswd
show add printer wizard = No
wins support = no

[sharefiles]
path = /home/[username]/[some directory]
guest ok = yes
read only = no
available = yes
browsable = yes
public = yes
writable = yes