I'm working in RH10 and when I try to preview a topic, I get a script error. How do I fix this?

I do use dhtml effect, like expanding text, but and even the pages without it bring up the error. Today, I'm not even getting an error, it just does nothing. I select Preview Topic from the right-click menu and nothing happens, not even an error (even on pages with DHTML effects). Before the holidays I had no issues, but when I came back from vacation, these issues started happening. It's very frustrating.