How to hide/show div tags using JavaScript?

Question

Basically, I'm trying to make a link that, when pressed, will hide the current body div tag and show another one in its place, unfortunately, when I click the link, the first body div tag still appears. Here is the HTML code:

<div id="body">
    <h1>Numbers</h1>
</div>
<div id="body1">
    Body 1
</div>

Here is the CSS code:

#body {
    height: 500px;
    width: 100%;
    margin: auto auto;
    border: solid medium thick;
}

#body1 {
    height: 500px;
    width: 100%;
    margin: auto auto;
    border: solid medium thick;
    display: hidden;
}

Here is the JavaScript code:

function changeDiv() {
  document.getElementById('body').style.display = "hidden"; // hide body div tag
  document.getElementById('body1').style.display = "block"; // show body1 div tag
  document.getElementById('body1').innerHTML = "If you can see this, JavaScript function worked"; // display text if JavaScript worked
}

NB: CSS tags are declared in different files

Answer 1

Have you tried

document.getElementById('body').style.display = "none";

instead of

document.getElementById('body').style.display = "hidden";?