How to modify javascript for multiple instances of an image gallery

I discovered this image modal on w3schools and I would like to modify the javascript so that i can have multiple images. My javascript knowledge is limited so any help will be greatly appreciated. Here is the link to the modal image gallery.

I thought that adding the following code and changing the variable name would be all that i needed to do but I was wrong. It

var img2 = document.getElementById('myImg');
var modalImg2 = document.getElementById("img01");
var captionText2 = document.getElementById("caption");
img.onclick = function(){ = "block";
    modalImg.src = this.src;
    captionText.innerHTML = this.alt;

Do you want to change the images with carousel option or insert all the images in the modal window?

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