From RemyWiki

[edit] How To

Select two users to compare, and pick which games you want to battle on. Click "Battle", and the database will ccompare who has a higher score on each song.

Each song score table cell features:

• A background color matching the colored name of the user who won the song. (A white background indicates a tie.)
• The difficulty of the song, with a link to View Song which will highlight both users' scores.
• The name of the DJ who won the song.
• The difference in the score between the users.

http://popnnavy.com/gifs/nodata.gif indicates that at least one of those users does not have any data entered for that particular difficulty.

On the right column, you'll see a variety of battle decisions (victor by number of songs won, a breakdown of wins by difficulty, victor by total score) as well as a list of battleground songs.

[edit] Battleground Songs

Battleground Songs, like songs within Striking Distance, are songs where the difference in score between the users is 500 points or less. The color indicates who won the song.