Set value for select lists?

Set value for select lists?

I have  a script for setting checkboxes checked or unchecked with

$('.checkall_pub').click(function () {
            $(this).parents('fieldset:eq(0)').find(':checkbox[name=pub_list\\[\\]]').attr('checked', this.checked);
         });

Now I want to have the same for a bunch of select lists...

How do I set all select lists to the value 0??

Thanx in advance!