[Help] Chained Select in CI 2.0

[eluser]masdevid[/eluser]
Hey all, I'm newbie using CI.
Here I don't know how to make chained <select> with latest CI. The select option is from database..
Here the database:
----------------------------------------
| Table: University |
----------------------------------------
| id_univ | name_university |
----------------------------------------
| 1 | State University of Malang |
| 2 | Brawijaya University |
----------------------------------------

--------------------------------------------
| Table: Department |
--------------------------------------------
| id_dep | name_department | id_univ |
--------------------------------------------
| 1 | Engineering | 1 |
| 2 | Education | 1 |
| 3 | Economics | 1 |
| 4 | Law | 2 |
| 5 | Psychology | 2 |
--------------------------------------------

Please help me, what i have to write in Controller, Models and Views.
In views, i prefer using table like this

Code:

<table>
<tr>
  <td>University :</td>
  <td><select name="university"><option>Select University</option></select></td>
</tr>
<tr>
  <td>Department :</td>
  <td><select name="department"><option>Select Department</option></select></td>
</tr>
</table>

Thanks before.