Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
Oh god Ninety Nine get your facts right. PS is written mainly in JavaScript (different to Java) with some HTML and CSS thrown in to deliver the content to you. Basically, learn the basics of HTML and CSS and then learn as much JS as you can if you want to explore the PS code, Chesnaught. Oh and there is a little PHP too, but its fairly minor.