<li id="create"><a href="#form" rel="external nofollow" ><span>創(chuàng)建相冊(cè)</span></a></li>

<div class="background"></div><div id="form">  <div class="fh">    <h1>創(chuàng)建相冊(cè)</h1>    <a class="close"><img src="pics/close.png" /></a>  </div>  ...</div>css代碼.background {  display: none;  position:fixed;  top:0px;  left:0px;  width:100%;  height:100%;  background-color:#fff;  background:-moz-radial-gradient(50% 50%, #fff, #000);/*gradient for firefox*/  background:-webkit-radial-gradient(50% 50%, #fff, #000);/*new gradient for webkit */  background:-webkit-gradient(radial, 0 50%, 0 50%, from(#fff), to(#000));/*the old grandient for webkit*/  opacity:0.5;  filter:Alpha(opacity=50);}#form {  display: none;  position:fixed;  border: 1px solid #ccc;     background-color:white;  top:30%;  left:30%;  width: auto;  border-radius:15px;  -moz-border-radius:15px;  box-shadow:0 5px 27px rgba(0,0,0,0.3);  -webkit-box-shadow:0 5px 27px rgba(0,0,0,0.3);  -moz-box-shadow:0 5px 27px rgba(0,0,0,0.3);}

function showForm() {  var create = document.getElementById("create");  var bg = document.getElementsByClassName("background")[0];  var form = document.getElementById("form");  var links = document.getElementsByClassName("close");  for(var i=0;i<links.length;i++) {    links[i].onclick = function() {    form.style.display = "none";    bg.style.display = "none";    }  }  create.onclick = function() {    form.style.display = "block";    bg.style.display = "block";  }