You can upload multiple images in a form and send it via ajax. You can preview the images and delete the images you don't want.
The form at index.html uses the events and functions defined in main.js. There you can find all the behavior.
The template function generates the preview html.
The updateImageDisplay function process the input change and updates the file list and the preview block.
The removeImageFromForm function handles the file deletion.
The sendForm function handles the form submit.
The rest of the functions are helpers for the ones described above.
I've included a basic style for the file input and for the layout in main.css.