jquery next and previous for popup not working in ie

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Hello All,

I use jquery for next and previous in popup. that popup contains some data. next and previous working perfectly on chrome and firefox but in ie its not working. i dont know the reason please review my code and give me any solution.

/*modal boxes****/

        $('.modal-box').hide();
        var meal = $('.meal');
        var currIndex = 0;
        var nextIndex = 0;
        var prevIndex = 0;
        var popClass = null;

        $('.bind').click(function (event) {
            var y = window.pageYOffset;
            event.preventDefault();
            $('.modal-box').hide();
            var meal = $('.meal');
            currIndex = meal.index(this);
            nextIndex = currIndex + 1;
            prevIndex = currIndex - 1;
            if (currIndex >= meal.length - 1) {
                nextIndex = 0;
            }
            else if (currIndex <= 0) {
                prevIndex = $(meal).length - 1;
            }
            $('.modal-box', this).modal({
                overlayClose: true
            });
            popClass = ('.simplemodal-container' + $(this).attr('id'));
            $(popClass).css("display", "block");
            $('.modal-box').css("display", "block");
            $('html, body').animate({ scrollTop: y });
            return false;
        });

       $('.next').click(function () {
            var y = window.pageYOffset;
            var mealLi = meal.eq(nextIndex);
            $.modal.close();
            $('.modal-box', mealLi).modal({
                overlayClose: true
            });
            currIndex = nextIndex;
            prevIndex = currIndex - 1;
            nextIndex = currIndex + 1;
            if (currIndex >= meal.length - 1) {
                nextIndex = 0;
            }
            $(this).val('');
            $('html, body').animate({ scrollTop: y });
        });

        $('.prev').click(function () {
            var y = window.pageYOffset;
            var mealLi = meal.eq(prevIndex);
            $.modal.close();
            $('.modal-box', mealLi).modal({
                overlayClose: true
            });
            currIndex = prevIndex;
            nextIndex = currIndex + 1;
            prevIndex = currIndex - 1;
            if (currIndex <= 0) {
                prevIndex = $(meal).length - 1;;
            }
            $(this).val('');
            $('html, body').animate({ scrollTop: y });
        });

        $('.simplemodal-close').click(function (e) {
            $('.modal-box', this).modal({
                overlayClose: false
            });
            $('#simplemodal-container').hide();
            $(popClass).css("display", "none");
            e.preventDefault();
            $('.modal-box').hide();
            popClass = null;
            return false;
        });
        /*modal boxes***/

Thanks & Regards
Sampath