Create a pop-up in Dreamweaver
- Select an image on a page.
Go to the Behavior panel (if it's not showing go to the Window menu to make it appear)

- Click the + sign and choose Popup Message
- Type in your message. Nothing on the page will look different.
- Press F12 to test the page.
- When you click on your text or image the popup message will appear if javascript is enabled in the browser.