<img src = "/images/daffy.jpg"> is in a header.html file that is included in PHP on pages in the root and in subfolders of the site. It will only work on a file on the root of the site as <img src = "../images/daffy.jpg"> but need to be <img src = "images/daffy.jpg"> if included on a file that is located in a subfolder. How can I have this header file work and the image appear when the file is included in another file regardless of where the other file is on the site?