CSS Slide Show -- Display a few photos, a few seconds at a time:
getElementById() -- Change text -- Find an HTML element (id="demo"), and change its content (innerHTML) to "Pay Close ATTENTION!":
getElementById() -- Change image -- Click on the image to summon the guards:
getElementById() -- Change style -- Click on the button to change SIZE and COLOR.
getElementById() -- Validate Input -- Think of a number between 1 and 10:
