add required alt tag
ids must be unique; multiple instances suggests these should be classes instead
</br> -> <br />
pretty sure you can't nest <p> tags. even if you can, pretty sure this one is in error anyway.
reinstating --- since I'm too lazy to look up what it does and too apathetic to care beyond knowing that they are apparently harmless
doctype requires closing <br>
Merge pull request #17 from Trott/2000

2000.html page has all manner of invalid HTML