Checkbox raw value displayed in Text box when checked

Hello All:

I would call myself a beginner when it comes to LiveCycle, so this question most would probably be considered pretty easy. I'm wondering how I can display a checkbox's raw value into a textbox whenever it is checked.  My form (form1) consist of several checkboxes with unique names on a different page ("page2"), while my textbox appears on "page1".  My goal is to populate my textbox with the unique names of each check box followed by a comma after the box is checked.

How would I about coding this?  Should I put this code on each checkbox or the textbox? Which tab would I put it on (i.e Calculate, Click, etc.)?

Any help would be greatly appreciated

Thanks,

DBC