Unfortunately..
RAWR-Player itself does not support a playlist. For this reason we made it so that after each file the current preview box gets closed and the a new box containing the next song gets opened.
Tricking the box by, after song 1 has finished, changing the contents so that the flash player gets respawned with song 2 will not work. As soon as the second song finishes, it will reopen the second song because the script thinks the first song just finished (because of its position) and in turn replays the file.
In short: untill the rawr-player supports a playlist, it cannot be done the easy way.