When you see “javascript:void(0)” in the browser status bar, it’s a normal thing to expect with JavaScript code on the page. More info on it iin the Codex. I am seeing javascript:void(null) for a browser link
Far as the buttons not doing anything when clicked is usually an issue with a conflict or the wrong jQuery being loaded in WordPress. There is some info about that here. What is this jQuery Conflict?
If you share your forum url with us someone can probably take a quick look and see if can find the problem.