jquery fill select option value

<select id="mark" name="mark">
  <option value="">--</option>
  <option value="bmw">BMW</option>
  <option value="audi">Audi</option>
</select>

I use above code to have my select drop down on the form and would like to 
use jQuery to fill option value on change event.
I would like know is it possible to do, if yes, any hint or example code at 
server site is appreciated,

Your help and information is great appreciated,

Regards,

Iccsi,