show hide 2 text boxes through dropdownlist

hi  :-)
I have a dropdown list which include "yes" and "no". When I click "yes", then there have to be 2 text boxes visible, just below the dropdownlist.
If the user selects "no" in the dropdownlist, then the 2 text boxes have to disappear again.

Does anyone have code for this?

thanks in advance! :-)
 

< ...