Ubuntu :: Run Script After Domain User Login?

I'm trying to integrate my Ubuntu PC into an Active Directory domain using Samba, Kerberos and Winbind. The task I'm trying to accomplish now is to automatically connect user folder from DFS server when domain user logs in. I created a simple (contains one line ) script to do that:

Code:
#!/bin/bash
mount //<server.domain>/Users$/$1 /media/dfs_user -o rw,user=<domain>\$1

I need to run this script with root privileges and parameter $(whoami) after domain user logs in so it results in command:

Code:
mount //<server.domain>/Users$/<username> /media/dfs_user -o rw,user=<domain><username>

What should I do? Is there any other better way (seems little unsecure like this)? I was thinking about adding this into /etc/fstab file, but don't know how to tell it what is the actual name of logged in user... I'm using Ubuntu 10.04 x32.