Changing form displayed based on drop down

[Kemik]

Hello,

 

I'm creating a calendar and want to display one form if the user selects One-time-event from a drop down menu or display a different one if they select Daily.

 

The only thing that really changes is that for one-time-event text field called date is displayed and if it's daily a drop down menu with the days of the week is displayed.

 

I've had a look around google but cannot really find anything that could help me.

 

Thanks for the help.