Due to the way the Internet works there is no guaranteed way to stop people from copying the images on your site, or to hide your HTML source code.

When you view a web page, your computer downloads the HTML source code and all the images to a temporary area on your hard disk, then displays the page. Even if you were to prevent people from (for example) right-clicking on your page and selecting "Save Image" or "View Source" they would still be able to look through the web browser's temporary folder and take copies of the images and HTML code.