Yes, that's a sure sign that you have JavaScripts disabled.
For Mozilla Firefox, you probably have the NoScript extension. In the bottom right corner of Firefox's window you will see an "S" click it and click "Allow serebii.net/serebiiforums.com"
If you use IE, I'm truly sorry to hear that. Anyway, you can turn on JavaScript by clicking on the bar that appears above the page saying something like "Internet Explorer has blocked this site from displaying ... blah blah blah..." and clicking "Allow content to be displayed".