On (release) { loading specified file from XML

Howdy yall. Made a MP3 player for site loads from XML. Has buttons for play, pause, forward and backward. I have been playing with the idea of having specified buttons throughout site load specific song files in addition to having the controls. I have written for one button


this.l1.onRelease = function() {
 (song_nr == 0) ? _global.song_nr=0 : _global.song_nr+1;
 _root.sound_mc.songStarter(songfile[song_nr], songname[song_nr]);
};


this.l1.onRelease = function() {
 (song_nr == 0) ? _global.song_nr=0 : _global.song_nr+2;
 _root.sound_mc.songStarter(songfile[song_nr], songname[song_nr]);
};

Thus loading song 1 or song 2. If I am setting song_nr equal to 0 then adding 1, 2, 3, ect… on choice throughout of musical icons throughout site. Any help much appreciated. Lost in Vegas. Need to get back to MN.
MT