Accordion problem

Accordion problem

How do I set the Accordion so that none of the elements are open when the page opens. I can close them once open with 'collapsible':

        $(function(){
            // Accordion
            $("#accordion").accordion({
            header: "h3",
            autoHeight: false,
            collapsible: true
            });
        });

But I don't want the first one to open to begin with.

Thanks,

Dan