Ok, so I have a few CSS files. In them, it contains (among other things): .class { a few values; } Code (markup): Now, the values are always different, but what I basically want to do is comment it out, so it becomes /* .class { a few values; }*/ Code (markup): I will also need to be able to undo the changes, so remove the comments with another function. I know I have to fopen, and probably some regex Cheers, BP