After adding first slide you will get visual overview of all slides
which is useful when typing in slide markers [42] in subtitles.
-When slide reisze finish, you might want to open http://localhost/html5tv/www/media.html
-in Firefox and check final result.
+When slide reisze finish, you might want to open http://localhost/html5tv/www/_editing.html
+in Firefox (you will have to open it through http server!) and check final result.