var myvari =""
   var myvarb = ""
   var ips = 0
   var incr2= 0
    
    if (document.images) {
    var blank = new Image()
    blank.src = "white.gif"
    
    var select = new Image()
    select.src = "fill.gif"
    
    
    var black = new Image()
    black.src = "black.gif"
    
    }
    
    function go() {
    ips = 0
    if (document.keyform.cordscal[0].checked == 1) {
    x = document.keyform.formula.options.selectedIndex;
    chordcode = document.keyform.formula.options[x].value;
    dispch(chordcode);
    myvari = chordcode
    myvarb = chordcode
    }
    else if (document.keyform.cordscal[1].checked == 1) {
    scalecalc();
    }
    else if (document.keyform.cordscal[2].checked == 1) {
    if (document.keyform.notesnum[2].checked == 1) {
    scalecalc();
    }
    else {
    ConvertInput();
    dispch(chordcode);
    myvari = chordcode
    myvarb = chordcode
    }
    }
    
    }
    
    function dispch(formulatext) {
    
    z = document.keyform.root.options.selectedIndex;
    root = document.keyform.root.options[z].value;
    
    if (document.keyform.notesnum[2].checked != 1) {
    if (formulatext.charAt(0) != "1") {
    userinput = document.keyform.forminput.value;
    if (document.keyform.cordscal[2].checked == 1) {
    if (userinput.charAt(0) != "1") {
    a = Number.NaN
    }
    }
    else {
    a = parseFloat(root) + 12
    }
    }
    else {
    a = Number.NaN
    }
    }
    formstring = ""
    inact();
    
    playnote(a);
    
    if (document.keyform.cordscal[2].checked == 1) {
    if (document.keyform.notesnum[1].checked != 1) {
    a = parseFloat(root) + 12
    }
    else {
    a = 13
    }
    }
    else {
    a = parseFloat(root) + 12
    }
    
    b = 0
    
    d = formulatext.length / 2
    
    for (var i = 0; i < d; i++) {
    b = formulatext.indexOf(",")
    myvar = parseFloat(formulatext.substring(0, b)) + a - 1
    playnote(myvar);
    formulatext = formulatext.substring(b + 1 , formulatext.length)
    }
    
    dispstring = formstring.substring(0, (formstring.length - 1));
    document.keyform.formdisp.value = dispstring;
    }
    
    function playnote(note) {
    if (document.images){
    if (note == 1){
    playkey(1)
    formstring = formstring + 'C,'
    }
    if (note == 2){
    playsharp(1)
    formstring = formstring + 'C#,'
    }
    if (note == 3){
    formstring = formstring + 'D,'
    playkey(2)
    }
    if (note == 4){
    formstring = formstring + 'Eb,'
    playsharp(2)
    }
    if (note == 5){
    formstring = formstring + 'E,'
    playkey(3)
    }
    if (note == 6){
    formstring = formstring + 'F,'
    playkey(4)
    }
    if (note == 7){
    playsharp(3)
    }
    if (note == 8){
    formstring = formstring + 'G,'
    playkey(5)
    }
    if (note == 9){
    formstring = formstring + 'G#,'
    playsharp(4)
    }
    if (note == 10){
    formstring = formstring + 'A,'
    playkey(6)
    }
    if (note == 11){
    formstring = formstring + 'A#,'
    playsharp(5)
    }
    if (note == 12){
    formstring = formstring + 'B,'
    playkey(7)
    }
    if (note == 13){
    formstring = formstring + 'C,'
    playkey(8)
    }
    if (note == 14){
    formstring = formstring + 'C#,'
    playsharp(6)
    }
    if (note == 15){
    formstring = formstring + 'D,'
    playkey(9)
    }
    if (note == 16){
    formstring = formstring + 'Eb,'
    playsharp(7)
    }
    if (note == 17){
    formstring = formstring + 'E,'
    playkey(10)
    }
    if (note == 18){
    formstring = formstring + 'F,'
    playkey(11)
    }
    if (note == 19){
    formstring = formstring + 'F#,'
    playsharp(8)
    }
    if (note == 20){
    formstring = formstring + 'G,'
    playkey(12)
    }
    if (note == 21){
    formstring = formstring + 'G#,'
    playsharp(9)
    }
    if (note == 22){
    formstring = formstring + 'A,'
    playkey(13)
    }
    if (note == 23){
    formstring = formstring + 'A#,'
    playsharp(10)
    }
    if (note == 24){
    formstring = formstring + 'B,'
    playkey(14)
    }
    if (note == 25){
    formstring = formstring + 'C,'
    playkey(15)
    }
    if (note == 26){
    formstring = formstring + 'C#,'
    playsharp(11)
    }
    if (note == 27){
    formstring = formstring + 'D,'
    playkey(16)
    }
    if (note == 28){
    formstring = formstring + 'Eb,'
    playsharp(12)
    }
    if (note == 29){
    formstring = formstring + 'E,'
    playkey(17)
    }
    if (note == 30){
    formstring = formstring + 'F,'
    playkey(18)
    }
    if (note == 31){
    formstring = formstring + 'F#,'
    playsharp(13)
    }
    if (note == 32){
    formstring = formstring + 'G,'
    playkey(19)
    }
    if (note == 33){
    formstring = formstring + 'G#,'
    playsharp(14)
    }
    if (note == 34){
    formstring = formstring + 'A,'
    playkey(20)
    }
    if (note == 35){
    formstring = formstring + 'A#,'
    playsharp(15)
    }
    if (note == 36){
    formstring = formstring + 'B'
    playkey(21)
    }
    }
    }
    
    function playkey(note){
    if (document.keyform.cordscal[1].checked == 1) {
    document.images['t' + note +''].src = eval('scalfil.src')
    document.images['m' + note +''].src = eval('scalfil.src')
    document.images['b' + note +''].src = eval('scalfil.src')
    }
    else if (document.keyform.cordscal[2].checked == 1) {
    if (document.keyform.notesnum[2].checked == 1) {
    document.images['t' + note +''].src = eval('scalfil.src')
    document.images['m' + note +''].src = eval('scalfil.src')
    document.images['b' + note +''].src = eval('scalfil.src')
    }
    else {
    document.images['t' + note +''].src = eval('select.src')
    document.images['m' + note +''].src = eval('select.src')
    document.images['b' + note +''].src = eval('select.src')
    }
    }
    else {
    document.images['t' + note +''].src = eval('select.src')
    document.images['m' + note +''].src = eval('select.src')
    document.images['b' + note +''].src = eval('select.src')
    }
    }
    
    function playsharp(note){
    if (document.keyform.cordscal[1].checked == 1) {
    document.images['s' + note +'b1'].src = eval('scalfil.src')
    document.images['s' + note +'b2'].src = eval('scalfil.src')
    document.images['s' + note +'b3'].src = eval('scalfil.src')
    }
    else if (document.keyform.cordscal[2].checked == 1) {
    if (document.keyform.notesnum[2].checked == 1) {
    document.images['s' + note +'b1'].src = eval('scalfil.src')
    document.images['s' + note +'b2'].src = eval('scalfil.src')
    document.images['s' + note +'b3'].src = eval('scalfil.src')
    }
    else {
    document.images['s' + note +'b1'].src = eval('select.src')
    document.images['s' + note +'b2'].src = eval('select.src')
    document.images['s' + note +'b3'].src = eval('select.src')
    }
    }
    else {
    document.images['s' + note +'b1'].src = eval('select.src')
    document.images['s' + note +'b2'].src = eval('select.src')
    document.images['s' + note +'b3'].src = eval('select.src')
    }
    
    }
    
    function inact() {
    if (document.images){
    for (var i = 1; i < 22; i++) {
    if (document.images['t' + i +''].src != blank.src) {
    document.images['t' + i +''].src = eval('blank.src')
    document.images['m' + i +''].src = eval('blank.src')
    document.images['b' + i +''].src = eval('blank.src')
    }
    }
    for (var i = 1; i < 16; i++) {
    if (document.images['s' + i +'b1'].src != black.src) {
    document.images['s' + i +'b1'].src = eval('black.src')
    document.images['s' + i +'b2'].src = eval('black.src')
    document.images['s' + i +'b3'].src = eval('black.src')
    }
    }
    
    }
    }
    
    function ConvertInput() {
    
    formulastring = ""
    
    userinput = document.keyform.forminput.value;
    
    if (userinput.indexOf(",", 0) != -1) {
    if (userinput.charAt(userinput.length - 1) != ",") {
    userinput = userinput + ",";
    }
    
    getValue(userinput);
    
    }
    else {
    error();
    }
    chordcode = formulastring + ","
    dispch(chordcode);
    }
    
    function error() {
    alert ("You did not enter the formula correctly");
    }
    
    function getValue(inputvar) {
    if (inputvar.indexOf(",", 0) != -1) {
    value = inputvar.substring(0, inputvar.indexOf(",", 0))
    valueb = inputvar.substring((inputvar.indexOf(",", 0) + 1), inputvar.length)
    changeValue(value);
    getValue(valueb)
    }
    }
    
    function changeValue(value) {
    if (value.length != 1) {
    if (value.indexOf("b", 0) != -1) {
    comp = -1
    }
    else if (value.indexOf("#", 0) != -1) {
    comp = 1
    }
    }
    else {
    comp = 0
    }
    
    if (document.keyform.notesnum[0].checked == 1) {
    if (value.length <= 2) {
    if (value.indexOf("1", 0) != -1) {
    if (value.indexOf("10", 0) != -1) {
    keypress = 17 + comp
    formulastring = formulastring + keypress + ",";
    }
    else if (value.indexOf("11", 0) != -1) {
    keypress = 18 + comp
    formulastring = formulastring + keypress + ",";
    }
    else if (value.indexOf("12", 0) != -1) {
    keypress = 20 + comp
    formulastring = formulastring + keypress + ",";
    }
    else if (value.indexOf("13", 0) != -1) {
    keypress = 21 + comp
    formulastring = formulastring + keypress + ",";
    }
    else {
    keypress = 1 + comp
    formulastring = formulastring + keypress + ",";
    }
    }
    else if (value.indexOf("2", 0) != -1) {
    keypress = 3 + comp
    formulastring = formulastring + keypress + ",";
    }
    else if (value.indexOf("3", 0) != -1) {
    keypress = 5 + comp
    formulastring = formulastring + keypress + ",";
    }
    else if (value.indexOf("4", 0) != -1) {
    keypress = 6 + comp
    formulastring = formulastring + keypress + ",";
    }
    else if (value.indexOf("5", 0) != -1) {
    keypress = 8 + comp
    formulastring = formulastring + keypress + ",";
    }
    else if (value.indexOf("6", 0) != -1) {
    keypress = 10 + comp
    formulastring = formulastring + keypress + ",";
    }
    else if (value.indexOf("7", 0) != -1) {
    keypress = 12 + comp
    formulastring = formulastring + keypress + ",";
    }
    else if (value.indexOf("8", 0) != -1) {
    keypress = 13 + comp
    formulastring = formulastring + keypress + ",";
    }
    else if (value.indexOf("9", 0) != -1) {
    keypress = 15 + comp
    formulastring = formulastring + keypress + ",";
    }
    }
    }
    else {
    a = 0
    if (value.indexOf("1", 0) != -1) {
    a = a - 12
    }
    else if (value.indexOf("3", 0) != -1) {
    a = a + 12
    }
    comp= comp + a
    if (value.indexOf("C", 0) != -1) {
    keypress = 1 + comp
    formulastring = formulastring + keypress + ",";
    }
    else if (value.indexOf("D", 0) != -1) {
    keypress = 3 + comp
    formulastring = formulastring + keypress + ",";
    }
    else if (value.indexOf("E", 0) != -1) {
    keypress = 5 + comp
    formulastring = formulastring + keypress + ",";
    }
    else if (value.indexOf("F", 0) != -1) {
    keypress = 6 + comp
    formulastring = formulastring + keypress + ",";
    }
    else if (value.indexOf("G", 0) != -1) {
    keypress = 8 + comp
    formulastring = formulastring + keypress + ",";
    }
    else if (value.indexOf("A", 0) != -1) {
    keypress = 10 + comp
    formulastring = formulastring + keypress + ",";
    }
    else if (value.indexOf("B", 0) != -1) {
    keypress = 12 + comp
    formulastring = formulastring + keypress + ",";
    }
    comp = 0
    }
    }
    
   
    
    function scalecalc(){
    
    scaletext = "";
    scaletext1 = "";
    scaletext2 = "";
    scaletext3 = "";
    
    u = 1
    t = 0
    i = 0
    
    if (document.keyform.cordscal[1].checked == 1) {
    x = document.keyform.scale.options.selectedIndex;
    scalevalue = document.keyform.scale.options[x].value.toUpperCase()
    }
    else if (document.keyform.cordscal[2].checked == 1) {
    if (document.keyform.notesnum[2].checked == 1) {
    scalevalue = document.keyform.forminput.value.toUpperCase()
    }
    else {
    scalevalue = document.keyform.forminput.value.toUpperCase()
    }
    }
    
    for (var y = 0; y < scalevalue.length; y++) {
    if (scalevalue.charAt(y) == "1") {
    t = 1 + u
    scaletext = scaletext +  t + ",";
    scaletext1 = scaletext1 +  (t - 12) + ",";
    scaletext2 = scaletext2 +  (t + 12) + ",";
    scaletext3 = scaletext3 +  (t - 24) + ",";
    }
    else if (scalevalue.charAt(y) == "2") {
    t = 2 + u
    scaletext = scaletext +  t + ",";
    scaletext1 = scaletext1 +  (t - 12) + ",";
    scaletext2 = scaletext2 +  (t + 12) + ",";
    scaletext3 = scaletext3 +  (t - 24) + ",";
    }
    else if (scalevalue.charAt(y) == "3") {
    t = 3 + u
    scaletext = scaletext +  t + ",";
    scaletext1 = scaletext1 +  (t - 12) + ",";
    scaletext2 = scaletext2 +  (t + 12) + ",";
    scaletext3 = scaletext3 +  (t - 24) + ",";
    }
    else if (scalevalue.charAt(y) == "4") {
    t = 4 + u
    scaletext = scaletext +  t + ",";
    scaletext1 = scaletext1 +  (t - 12) + ",";
    scaletext2 = scaletext2 +  (t + 12) + ",";
    scaletext3 = scaletext3 +  (t - 24) + ",";
    }
    else if (scalevalue.charAt(y) == "5") {
    t = 5 + u
    scaletext = scaletext +  t + ",";
    scaletext1 = scaletext1 +  (t - 12) + ",";
    scaletext2 = scaletext2 +  (t + 12) + ",";
    scaletext3 = scaletext3 +  (t - 24) + ",";
    }
    else if (scalevalue.charAt(y) == "6") {
    t = 6 + u
    scaletext = scaletext +  t + ",";
    scaletext1 = scaletext1 +  (t - 12) + ",";
    scaletext2 = scaletext2 +  (t + 12) + ",";
    scaletext3 = scaletext3 +  (t - 24) + ",";
    }
    else if (scalevalue.charAt(y) == "7") {
    t = 7 + u
    scaletext = scaletext +  t + ",";
    scaletext1 = scaletext1 +  (t - 12) + ",";
    scaletext2 = scaletext2 +  (t + 12) + ",";
    scaletext3 = scaletext3 +  (t - 24) + ",";
    }
    else if (scalevalue.charAt(y) == "8") {
    t = 8 + u
    scaletext = scaletext +  t + ",";
    scaletext1 = scaletext1 +  (t - 12) + ",";
    scaletext2 = scaletext2 +  (t + 12) + ",";
    scaletext3 = scaletext3 +  (t - 24) + ",";
    }
    else if (scalevalue.charAt(y) == "9") {
    t = 9 + u
    scaletext = scaletext +  t + ",";
    scaletext1 = scaletext1 +  (t - 12) + ",";
    scaletext2 = scaletext2 +  (t + 12) + ",";
    scaletext3 = scaletext3 +  (t - 24) + ",";
    }
    u = t
    }
    
    if (document.keyform.lingerscal.checked == 1) {
    totalscale =  scaletext + scaletext1 + scaletext3 + scaletext2
    }
    else {
    totalscale = scaletext
    }
    dispch(totalscale);
    }
    
    function inverter() {
    ndums = (ips*2) + incr2
    if (ndums >= myvarb.length) {
    ndums = 0
    ips = -1
    myvari = myvarb
    incr2= 0
    }
    else {
    if (myvarb.charAt(ndums +1) != ","){
    chartf = myvarb.substring(ndums, (myvarb.indexOf(",")+ ndums +1))
    incr = 2
    incr2= 1
    }
    else {
    chartf = myvarb.substring(ndums, (myvarb.indexOf(",")+ ndums))
    incr = 1
    incr2= 0
    }
    tochange = parseFloat(chartf)
    myvari = myvarb.substring(0, ndums) + (tochange - 12) + myvarb.substring((ndums + incr), myvarb.length)
    }
    dispch(myvari);
    ips ++
    }