capo.js

       <script>

            var match;

            var chords = ['C', 'C#', 'D', 'Eb', 'E', 'F', 'F#', 'G', 'Ab', 'A', 'Bb', 'B', 'C', 'Db', 'D', 'D#', 'E', 'F', 'Gb', 'G', 'G#', 'A', 'A#', 'C'];

            var chordRegex = /C#|D#|F#|G#|A#|Db|Eb|Gb|Ab|Bb|C|D|E|F|G|A|B/g;

            $('#transposeUp, #transposeUp1').click(function() {

                $('.c').each(function() {

                    var currentChord = $(this).text();

                    var output = "";

                    var parts = currentChord.split(chordRegex);

                    var index = 0;

                    while (match = chordRegex.exec(currentChord)) {

                        var chordIndex = chords.indexOf(match[0]);

                        output += parts[index++] + chords[chordIndex + 1];

                    }

                    output += parts[index];

                    $(this).text(output);

                });

            });

            $('#transposeDown, #transposeDown1').click(function() {

                $('.c').each(function() {

                    var currentChord = $(this).text();

                    var output = "";

                    var parts = currentChord.split(chordRegex);

                    var index = 0;

                    while (match = chordRegex.exec(currentChord)) {

                        var chordIndex = chords.indexOf(match[0], 1);

                        output += parts[index++] + chords[chordIndex - 1];

                    }

                    output += parts[index];

                    $(this).text(output);

                });

            });           

        </script>