[Javascript][Html] I got several onchange functions via dropdown that show pictures... 
For Example: onchange A; onchange B;

If i pick a picture from the onchange B function, the picture of A disappears...
So how do you fix that? 

```
    <!DOCTYPE html>
    <html lang="en">
    <head>
      <title>Bootstrap Example</title>
      <meta charset="utf-8">
      <meta name="viewport" content="width=device-width, initial-scale=1">
      <link rel="stylesheet" href="bootstrap-css/css/bootstrap.min.css">
      <link rel="stylesheet" href="Style.css" type="text/css">
      <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.0/jquery.min.js"></script>
      <script src="bootstrap-css/js/bootstrap.min.js"></script>

          <script type="text/javascript">
      function displayImage(elem1) {
        var image1 = document.getElementById("body");
        image1.src = elem1.value;}

      function displayImage(elem2) {
        var image2 = document.getElementById("buttons");
        image2.src = elem2.value;}

      function displayImage(elem3) {
        var image3 = document.getElementById("Dpad");
        image3.src = elem3.value;}

      function displayImage(elem4) {
        var image4 = document.getElementById("Sticks");
        image4.src = elem4.value;}

      function displayImage(elem5) {
        var image5 = document.getElementById("Top");
        image5.src = elem5.value;}
        </script>

    </head>
<body>
<img src="Bilder/Custom/EmptyBody.png" alt="EmptyBody" class="i0">    

    <img id="body" class="i1">
    <img id="buttons" class="i1">
    <img id="Dpad" class="i1">
    <img id="Sticks" class="i1">
    <img id="Top" class="i1">

        <select name="imageList1" onchange="displayImage(this);">
      <option value="Bilder/Custom/Body/BlackBody.png">Black</option>
      <option value="Bilder/Custom/Body/BlueBody.png">Blue</option>
      <option value="Bilder/Custom/Body/GreenBody.png">Green</option>
      <option value="Bilder/Custom/Body/OrangeBody.png">Orange</option>
      <option value="Bilder/Custom/Body/RedBody.png">Red</option>
      <option value="Bilder/Custom/Body/WhiteBody.png">White</option>
      <option value="Bilder/Custom/Body/YellowBody.png">Yellow</option>
      <option value="Bilder/Custom/Body/RainbowBody.png">Rainbow</option>
</select>

    <select name="imageList2" onchange="displayImage(this);">
      <option value="Bilder/Custom/Buttons/StandardButtons.png">Standard</option>
      <option value="Bilder/Custom/Buttons/360Buttons.png">360-Buttons</option>
</select>

    <select name="imageList3" onchange="displayImage(this);">
      <option value="Bilder/Custom/Dpad/BlackDPad.png">Black</option>
      <option value="Bilder/Custom/Dpad/WhiteDPad.png">White</option>
</select>

    <select name="imageList4" onchange="displayImage(this);">
      <option value="Bilder/Custom/Sticks/BlackSticks.png">Black</option>
      <option value="Bilder/Custom/Sticks/WhiteSticks.png">White</option>
</select>

    <select name="imageList5" onchange="displayImage(this);">
      <option value="Bilder/Custom/Top/BlackTop.png">Black</option>
      <option value="Bilder/Custom/Top/BlueTop.png">Blue</option>
      <option value="Bilder/Custom/Top/GreenTop.png">Green</option>
      <option value="Bilder/Custom/Top/OrangeTop.png">Orange</option>
      <option value="Bilder/Custom/Top/RedTop.png">Red</option>
      <option value="Bilder/Custom/Top/WhiteTop.png">White</option>
      <option value="Bilder/Custom/Top/YellowTop.png">Yellow</option>
</select>
</body>
</html>

```