It's amazing how posting a question on UT will immediately cause you to see the really stupid mistake you made isn't it? I can't count the number of times I've done that - and then had to post "Never mind....."
The HTML for formatting code is really simple. Use < pre > in front of your source code (be sure the spaces I added are removed) and then put < /pre > after the source code. Use the Preview button to check it out.
And you can see how anyone ELSE's message is formatted by clicking 'reply'. All the tags are visible.
HTH
Barbara