function changesong(direction)
if controls.press("l") and song:percent() <1 or direction == "down" then
    if equalizer.songposition>1 then
        for i= equalizer.songposition-1,1,-1 do
            if files.ext(equalizer.list[i].name) == "mp3" or files.ext(equalizer.list[i].name) == "at3" or
            files.ext(equalizer.list[i].name) == "bgm" or files.ext(equalizer.list[i].name) == "wav" then
                equalizer.songposition= i
                song:stop();
                song:free();
                song=sound.load(equalizer.list[i].name);
                equalizer.id3={}
                equalizer.id3=sound.id3(equalizer.list[i].name)
                song:play();
                break
            end
        end
    end
end
if controls.press("r") or direction == "up" then
    if equalizer.songposition<#equalizer.list then
        for i= equalizer.songposition+1,#equalizer.list do
            if files.ext(equalizer.list[i].name) == "mp3" or files.ext(equalizer.list[i].name) == "at3" or
            files.ext(equalizer.list[i].name) == "bgm" or files.ext(equalizer.list[i].name) == "wav" then
                equalizer.songposition= i
                song:stop();
                song:free();
                song=sound.load(equalizer.list[i].name);
                equalizer.id3={}
                equalizer.id3=sound.id3(equalizer.list[i].name)
                song:play();
                break
            end
        end
    end
end