<script src="jquery-1.7.2.min.js"></script>
      <script>
        jQuery(document).ready(function($) {
            $(window).scroll(function(event) {
                var dTop = $(document).scrollTop();
                //console.log(top);
                $('.item').each(function(index, el) {
                    var iTop = $(el).offset().top-350;
                    //console.log(iTop);
                    if( dTop > iTop){
                       var currIndex = $(el).index();
                       //console.log(currIndex);
                    }else{
                        return false;
                    }
                    $('#menu a').eq(currIndex-1).addClass('current').siblings().removeClass();              
                });
            });
        });
      </script>

左侧滚动时，右侧显示对应的楼层，但怎么让其它楼层的样式消失,用removeClass不起作用？