Jquery实现顶部弹出框特效

<div class="tooltiptop"> <div class="bg"></div> <div class="main"><i>Jq顶部弹出框</i><span onClick="ToolTipTop.Hide();" title="关闭">X</span></div></div>

body {  margin: 0;  padding: 0;}.tooltiptop {  width: 100%;  height: 50px;  margin-top:-50px;  display:none;}.tooltiptop .bg {  width: 100%;  background-color: #333;  height: 50px;  opacity: .7;  position: absolute;  margin: 0;}.tooltiptop .main {  width: 100%;  position: absolute;  margin: 0;  height: 50px;  line-height: 50px;  text-align: center;  color: #fff;}.tooltiptop .main span {  float: right;  color: #fff;  margin-right: 20px;  cursor: pointer;}

var ToolTipTop={  Show:function(Msg){    $(".tooltiptop .main i").html(Msg);    $(".tooltiptop").css("display","block").animate({marginTop:"0px"},500);  },  Hide:function(){    $(".tooltiptop").animate({marginTop:"-50px"},500,function(){$(this).css("display","none")});  }}

<style type="text/css">*{margin:0;padding:0;list-style-type:none;}a,img{border:0;}.demo{margin:0 auto 0 auto;padding:200px 0 0 0;width:400px;text-align:center;font-size:18px;}.demo .action{color:#3366cc;text-decoration:none;font-family:"微软雅黑","宋体";}#Header{ position:fixed;z-index:9999999;top:0;right:0;left:0;height:38px;border-bottom:1px solid #e0dede;width:100%; background-color:#F7F7F7; background-image:linear-gradient(#fff, #f7f6f5); background-image:-moz-linear-gradient(#fff, #f7f6f5); background-image:-o-linear-gradient(#fff, #f7f6f5); background-image:-webkit-linear-gradient(#fff, #f7f6f5);  box-shadow:inset 0 1px #fff, 0 1px 3px rgba(34,25,25,0.4); -moz-box-shadow:inset 0 1px #fff, 0 1px 2px rgba(34,25,25,0.4); -webkit-box-shadow:inset 0 1px #fff, 0 1px 3px rgba(34,25,25,0.4);}*html,*html body{background-image:url(about:blank);background-attachment:fixed;}*html #Header{position:absolute;top:expression(eval(document.documentElement.scrollTop));}.overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:998;width:100%;height:100%;background:#f6f4f5;display:none;}*html,*html body{background-image:url(about:blank);background-attachment:fixed;}*html .destroy,*html .overlay{position:absolute;top:expression(eval(document.documentElement.scrollTop));}.destroy{position:fixed;top:0px;left:50%;margin-left:-425px;*margin-left:-718px;_margin-left:-425px;margin-top:-292px;z-index:99996;opacity:0;filter:alpha(opacity=0);}.sheet{position:relative;width:840px;height:290px;margin:auto;padding:0;background:#fff9e2 url("images/tips_bg.gif"); box-shadow:inset 0 -1px 0 #FFF,0 1px 6px rgba(0,0,0,.3); -moz-box-shadow:inset 0 -1px 0 #FFF,0 1px 6px rgba(0,0,0,.3); -webkit-box-shadow:inset 0 -1px 0 #FFF,0 1px 6px rgba(0,0,0,.3);  border-bottom:2px solid #efebda; border-bottom-left-radius:5px; border-bottom-right-radius:5px; -moz-border-bottom-left-radius:5px; -moz-border-bottom-right-radius:5px; -webkit-border-bottom-left-radius:5px; -webkit-border-bottom-right-radius:5px;}.sheet a.close{display:block;position:absolute;width:20px;height:20px;right:5px;top:5px;background:url("images/sheet_close.gif") no-repeat;}.sheet a:hover.close{background-position:0 -30px;}.sheet a:active.close{background-position:0 -60px;}.sheet .head{padding:20px 15px;border-bottom:1px solid #f6f4ee;}.sheet .head h2{padding:0;font-size:18px;font-weight:400;color:#444;text-align:center;}.sheet .body{padding:10px 15px;border-top:1px solid #fff;}</style>

<script type="text/javascript" src="js/jquery-1.4.2.min.js"></script><script type="text/javascript">$(document).ready(function(){  var h = $(document).height(); $(".overlay").css({"height": h });   $(".action").click(function(){  $(".overlay").css({'display':'block'}).animate({'opacity':'0.8'});  $(".destroy").stop(true).animate({'margin-top':'40px','opacity':'1'},400);  });  $(".close").click(function(){  $(".destroy").stop(true).animate({'margin-top':'-292px','opacity':'0'},800); $(".overlay").css({'display':'none'}).animate({'opacity':'0'});  }); });</script>

<div id="Header"></div><div class="demo"><a class="action" href="javascript:void(0);">jquery float浮动层弹出层页面加载特效</a></div><div class="overlay"></div><div class="destroy"> <div class="sheet"> <div class="head">  <h2>jquery顶部动画弹出层</h2> </div> <div class="body"></div> <a class="close" title="关闭" href="#"></a> </div></div><!--sheet end-->