To get this dialog, click “Call Function from document” or “Call Function from browser” from “Debugging” menu or from “Debugging toolbar”. You can also call this dialog from built-in browser, just click “Call JavaScript Function” button

1) Click “Call Function from document” button.
You will see the following.

Choose a function from combobox and enter parameters like above.
And you will get the next results:

You can use the abilities, mentioned above, not only in “HTML” documents but and in “JS” documents.

See also other dialogs: Preferences Find & Replace Insert Image Insert Table HyperLink Email Link Named Anchor Form Elements Insert special character Customize date/time format Formatting JavaScript Send by Email