Accordion sliding speed?

I'm trying to use the latest accordion 1.7.1 and I was wondering how to adjust how fast it slides.
http://docs.jquery.com/UI/Accordion

I'm using jquery-1.3.2.min.js and jquery-ui-1.7.1.custom.min.js with:

jQuery("#mainaccordion").accordion({
collapsible: true,
header: "p"
});

Anyone know how to simply make it slide slower?

Thanks.