Jquery UI datepicker, onclick of a date , get the date and pass to URL

I have a jquery UI datepicker calendar in an event page(sharepoint page).

$('#datepicker').datepicker();

I need to get the date once user clicks on any date and get that date and pass it to the page url as mypage.aspx?dt=1/12/2012.I have this but not working.

$('.ui-datepicker td a').click(function(){  
        var url=$(location).attr('href');
        var date = $(this.datepicker( "getDate" ));
                if(date != 'null')
            url += '&dt=' + date;           
        window.location.href=url;
        });

Neither is this working..

$('.ui-datepicker td a').click(function() { 
        window.location.href = 'http://mysite/events/Pages/default.aspx?dt=' + $('#datepicker').datepicker().val();
        });

can someone help?