$(function() {
	var nbElements = $('.slider-pagination li').size();
	var position = 1;
    var slide_height = $('.slide').height();
		
    if (nbElements > 1) {
        $('.slider-pagination li a').click(function() {
            var position = $(this).html();
            display_slide(position);
            clearInterval(changeSlide);
            return false;
        });
        
        function anim() {
            position++;
            display_slide(position);
            if (position == nbElements) {
                position = 0;
            }
        }

        function display_slide(num) {
            $('.slider-pagination li a.active').toggleClass('active');
            $('.slider-pagination li a#pslide-' + num).toggleClass('active');
            
            $('.slides').animate (
                {top: (num - 1) * -slide_height},
                500  
            );
        }
        
        var changeSlide = setInterval(anim, 7000);
    }
})