使用JavaScript单击图像时，在新窗口中显示图像

I am working on a website for a construction company I work for. This is my first attempt at building a website from scratch. The main purpose of the site is to show pictures of completed projects. I have the site formatted with thumbnail image galleries and when an image is hovered over, it will display in a medium sized div directly above the thumbnail gallery. I'm trying to get a new window to display a larger version of the image when the medium sized div is clicked. And eventually I'd like the new window to have the ability to navigate through all images with prev/next buttons, so the user doesn't have to close and re-open a window for every picture. Any help would be greatly appreciated! I am working on a website for a construction co