Build a Website

We need to build a site that works similar to Pinterest in design and functionality. There are only going to be one or two pages to code. The main page is a collection of images that are arranged together to form a collection of virtual billboards. Each image is of different dimensions (but only 5 different sizes in total), but has to be arranged together regardless of size. When a user clicks on an image, a popup should open that shows either text (such as a blog post with visuals) or a detailed image that is associated with the image that was clicked. The images must be endless so ajax functionality is important. The user must be able to keep scrolling and seeing new images without requiring to be redirected to a new page. The second page is just a homepage that a user can click to get redirected to the main page.