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<script type="text/jаvascript" >
        $(document).ready(function() {
            $('.minus').click(function () {
                var $input = $(this).parent().find('input');
                var count = parseInt($input.val()) - 1;
                count = count < 1 ? 1 : count;
                $input.val(count);
                $input.change();
                return false;
            });
            $('.plus').click(function () {
                var $input = $(this).parent().find('input');
                $input.val(parseInt($input.val()) + 1);
                $input.change();
                return false;
            });
        });
    </script>

<div class="number">
    <span class="minus">-</span>
    <input type="text" value="1" size="5"/>
    <span class="plus">+</span>
</div>