Which is the file where jquery is loaded?

Hi,

I’m adding a script doing with jquery to the page. The problem is that my script is loaded before jquery.js.

I need to know the file where jquery is loaded, so I can to load my script after.

I have been looking for it but I cant find it where it’s supposed it must to be.

It’s not in catalog.xml and page.xml, where I can find it?