Hi,
I want to create a student registration form in joomla 1.5 with smart former and it has different user input fields. That is
User First Name:
User Last Name:
Auto generate unique ID Number(2digit)
Option field (Select Predefine course)
User ID
Password
E-mail
Phone
Address
Others Info
Now, I would like to sum of four fields and save the result in “User ID” field in the same form. That is
First Name+Last Name+Auto generate unique ID Number(2 digit)+Option field (Select Predefine course) =User ID
for example : “jhon.doe01cad”
How to do that ? Any suggestion, I'm new in joomla...

