$(function(){
    $('select#events').change(function(){
        var optVal = $(this).val();
        if (optVal == 'all'){
            $('ul.events li').show();
        } 
        else if (optVal == 'forth'){
            $('ul.events li.ongoing').hide('fast',function(){$('ul.events li.forthcoming').show();});
        }
        else if (optVal == 'ongoing'){
            $('ul.events li.forthcoming').hide('fast',function(){$('ul.events li.ongoing').show();});
        }
    });
});