Conditional logic for donation form ?

Hi -

Our organization recruits donations in time and money and I'd like to have single form where folks can register and select drom among the following options:

1. Donate Time

2. Donate Money

3. Donate Time & Money

My hope woud be that selecting option 1 would allow the user to by-pass the donation blcok, while optios 2 and 3 would take the user through the Donation Block for payment. 

Is this possible without custom code? (We really don't have the resources to develop & support custom code.)

Thanks in advance -