Database outputs two links (sd and hd) for each episode.
iframe code will by default load the latest 'hd' else 'sd'.
Below iframe, two links which can change between 'sd' or 'hd' links [if link selected, dynamically reload iframe]
Below that generate list (episode 1, 2, 3, etc.) [if episode from list is selected, dynamically reload iframe]
Note: 'dynamically reload' - does not reload page (use jQuery or such).