How do I duplicate the entry to a set of fields when a box is checked?

Question

I already know how to duplicate specific fields. I don't want the field duplicated if a certain box is unchecked (this would apply for a set of seven different boxes, that when the check box is selected, all seven fields would copy their respective matching fields).
Example:
Billed Address    vs.   Service Address
Sometimes these are the same and sometimes they aren't. I need the option to copy the billed info to the service address if it is the same so I don't have to type in duplicate information.
Thanks!

Answer 1

Create 2 text fields and a check box.
Use this as the mouse up script for the check box:
if (event.target.value!="Off") {           //If checkbox is ticked
this.getField("Textbox2").value = this.getField("Textbox1").value;         //Make the contents of the two text fields the same. Replace with the names of your fields.
else this.getField("Textbox2").value = "";          //Clear Textbox2 if checkbox is not ticked