First, put all the content text boxes in a group. Then on the buttons:
- Disable the button action - the action that is built into the button. I hardly ever use them because I so frequently want to code actions that come before the one I originally put on the button.
- Click on the button and then add an action to the button. I usually click on the action icon in a toolbar but you can also Right Click > New > Action or use Ctrl+4. The action should Hide the group created above.
- Add another action to the button to Show the text box you want.
You can add images and other content to the group and other Show actions on each button.