Jquery code-complete

Could someone please tell me how to enable javascript(and jquery) code complete.I thought it would be out of the box(at least for DOM levels), but apparently it's not.
For example when typing window there is no onload in the pop-up list, etc.And please if anyone can tell me how to get code-complete for Jquery(or any other library).
I'm thinking switching over from Aptana,but i'm stuck in these basics.

Thanks,

Mirko