<a href='#' class='slide-1 num'>1</a>
<a href='#' class='slide-2 num'>2</a>
<a href='#' class='slide-3 num'>3</a>

$('.num').click(function(){
            var index = $('.num').index($(this));
            gotoSlide(index);
            return false;
        });

function gotoSlide(i){
        var currentSlide=i;
        if(currentSlide>=$('.slidewrapper').children().size())
        {
            currentSlide=0;   
        }
        $('.slidewrapper').animate({left: -currentSlide*slideWidth},300).data('current',currentSlide);
        return false;
    }