js/jq滚动到一定位置后固定显示

function htmlPosition(obj)
{
 var o = obj;
 var t = o.offsetTop;
 var l = o.offsetLeft;
 while(o = o.offsetParent)
 {
  t += o.offsetTop;
  l += o.offsetLeft;
 }
 obj.data_top = t;
 obj.data_left = l;
}

var oldHtmlWidth = document.documentElement.offsetWidth;
window.onresize = function(){
 var newHtmlWidth = document.documentElement.offsetWidth;
 if(oldHtmlWidth == newHtmlWidth)
 {
  return;
 }
 oldHtmlWidth = newHtmlWidth;
 elFix.style.position = 'static';
 htmlPosition(elFix);
 htmlScroll();
}
window.onscroll = htmlScroll;

var elFix = document.getElementById('fixedRight');
htmlPosition(elFix);

</script>

jQuery(window).scroll(function() {
        if (scTop() > sideTop) {
        if(jQuery("#fixed-siderbar").length == 0){
            //下面是要显示的模块，复制侧边栏中的标签云内容，追加到侧边栏的底部
            var tag = jQuery("#tag_cloud-2 .widget-wrap").clone().html();
            var html="<div id='fixed-siderbar'><div id='fixed-wrap'><div id='fixedTag' class='widget  widget_tag_cloud' >"+ tag +"</div></div></div>"
            jQuery("#sidebar").append(html);
        }else{
            jQuery("#fixed-siderbar").show();
        }
    }else{
        jQuery("#fixed-siderbar").hide();
    };
  });
});