Now you see me

How can I get a sub form to be visible or hidden based on the state of a checkbox

See

http://www.madera-county.com/index.php/forms-and-documents/category/8- administration-documents?download=5090:2014-01-04-00-28-25

I have the sub forms only show when the checkboxes are checked but when I uncheck them nothing happens.

On top of that when a user goes to save a document it resets the state of the sub forms and they are invisible again.

Can you help me work through this.