消息提示弹层滚动JQUERRY

/*風*/
var Life={};
Life.pmLoad=function(){
	$.getJSON('json.js',
	 function(d){
		 if(d&&d.res=='ok'){
			 if(d.count>0){
				var arr=new Array();
				i=0;
				for( a in d.data ){
					var r=d.data[a];
					arr.push('<div class="fuc_news" id="life_pm_'+r.logid+'">');
					arr.push('<span class="fc_tit">');
					arr.push('<span class="tit_l">【最新消息】</span>');
					arr.push('<span class="tit_r" >X</span>');
					arr.push('</span>');
					arr.push('<div class="fc_con clearfixs">');
					if(r.url&&r.url!=''){
						arr.push('<a href="'+r.url+'" target="_blank" onclick="Life.pmClick('+r.logid+')">'+r.msg+'</a>');
					}else{
						arr.push('<a href="home.php?mod=space&do=pm&subop=view&touid=1#bottom" target="_blank" >'+r.msg+'</a>');
					}
					arr.push('</div></div>');
					i++;
				}
				Life.Num=i;
				$('#pmWrapHtml').html(arr.join(''));
				Life.pmGo();
			 }
		 }
	 });
}
Life.pmClose=function(id){
	$('#life_pm_'+id).hide();
}
Life.pmClick=function(id){
	$.get("index.php?r=pm/click&id="+id);
}
Life.pmGo=function(){
	var s_top=0;
	var s_p=0;
	var PmNum=0;
	//浏览器高度
	var browserHeight=$(window).height();
	//HTML高度
	var tmphtmlHeight=htmlHeight=Life.Num*98;
	//滚动外框高度
	var floatNewsBoxsHeight=browserHeight;
	var PmHtml=$('#pmWrapHtml');
	var PmWap=$("#pmWrap");
	
	$("#pmWrapHtml div.fuc_news").each(function(){
		tmphtmlHeight=tmphtmlHeight-98;
		$(this).css("top",tmphtmlHeight+"px");
		
	});
	PmWap.height(floatNewsBoxsHeight).show();
	PmHtml.css('height',htmlHeight+'px').css('top',floatNewsBoxsHeight+'px').animate({'top':(floatNewsBoxsHeight-htmlHeight)+'px'},Life.Num*0.5*1000);
	//关闭层
	$("#pmWrapHtml div.fuc_news .fc_tit .tit_r").click(function(){
		var tParent=$(this).parent().parent();
		tParent.hide();
		s_p=tParent.index();
		PmNum++;
		tmphtmlHeight=Life.Num*98;
		for (var i=0;i<Life.Num;i++){
			tmphtmlHeight=tmphtmlHeight-98;
			if(i<=s_p){
				continue;
			}
			$("#pmWrapHtml div.fuc_news:eq("+i+")").animate({'top':(tmphtmlHeight+PmNum*98)+'px'});
		}
	});
	//浏览器滚动
	s_top= PmWap.css("top");
	$(window).scroll(function(){
			var ss_top=parseInt(s_top);
			var sc_top=$(this).scrollTop();
			var su_top=ss_top+sc_top
			PmWap.css("top",su_top+"px")
	});
}
$(document).ready(function(){
	Life.pmLoad();
})

案例地址：http://download.csdn.net/detail/wljk506/5166607