What is PNG mode?
PNG, for Portable Network Graphics, is a very versatile lossless bitmap format, like GIF or BMP. It offers quite a lot of features, is very unencumbered, and available on every platform.
PNG is the standard format that Pandimaniacs strips are offered in. The reason you're seeing the link to this page is that you switched to another mode, such as SVG or TXT mode. Simply click the PNG button to switch back.