[jQuery] Test if jquery has loaded

Is there a small piece of code you can put on a page to test if jquery has loaded? Thanks

[jQuery] Scroll behaving odd in Firefox

Hi all, first time I've used jQuery. I'm using it for a basic scroll to anchor function. I started with it on the back to top links then I moved to using it on a small anchor navigation at the top of the page. It works fine in Safari on the mac and IE on the PC but for some reason the top links