html - Displaying new rows of buttons and images on button clicks -


i apologize in advance-- i'm very, new this.

i want have 2 rows of buttons change 1 set of images displays on page. ideally, when button on top row clicked, 3 or 4 images displayed, , buttons on second row appear. buttons on second row, when clicked, replace images clicking on first row displayed, , leave second row displaying.

the idea display various guitar chord positions, if first button on top row clicked, a, 3 or 4 positions major chords displayed, , images replaced clicking buttons on second row; buttons minor, seventh, etc, , display few positions well.

i've vastly oversimplified i'm trying do, jsfiddle: https://jsfiddle.net/tktyytmt/

    <script>   function myfunction() {     var x = document.getelementbyid('mydiv');     if (x.style.display === 'block') {       x.style.display = 'none';     } else {       x.style.display = 'block';     }   }   </script>   <script>   function myotherfunction() {     var x = document.getelementbyid('myotherdiv');     if (x.style.display === 'block') {       x.style.display = 'none';     } else {       x.style.display = 'block';     }   }   </script> <div>   <ul style="list-style-type:none" id="navlist">     <li class="titles">letter:</li>     <br>     <li>       <button onclick="myfunction()" class='button'>a</button>       <div id="mydiv">         <img src="https://i.pinimg.com/564x/77/97/2d/77972d9d8364c1c94aa6520af5836548.jpg" class='chordimg'>         <img src="http://i.stack.imgur.com/sqcay.png" class='chordimg'>       </div>     </li>   </ul>   <div>     <ul style="list-style-type:none" id="navlist">       <li class="titles">color</li>       <br>       <li>         <button onclick="myotherfunction()" class='button'>blue</button>         <div id="myotherdiv">           <img src="http://www.drodd.com/images15/letter-a25.jpg" class='chordimg'>           <img src="https://etc.usf.edu/presentations/extras/letters/varsity_letters/39/13/a-400.png" class='chordimg'>           <img src="http://www.polyvore.com/cgi/img-thing?.out=jpg&size=l&tid=42246936" class='chordimg'>         </div>       </li>   #mydiv {   display: none;   position: absolute;   top: 125px;   left: 40px; }  #myotherdiv {   display: none;   position: absolute; }  #navlist li {   display: inline;   list-style-type: none;   padding-right: 20px; }


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