动画效果的弹出框，弹出时背景变灰

HTML代码

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>可移动的弹出框</title><style type="text/css"></style></head><body ><div id="bodyL"> <a href="#" onclick = "show('fd',event);return false;"> [打开层] </a> </div><div id="fd" style="display:none;filter:alpha(opacity=100);opacity:1;">  <div class="contentup"> <a href="#" class="od" onclick = "closeed('fd');return false;"> 关 闭 </a>    <div id="tittleup">销售话术</div>    <ul id="upcontent">      <li><span style='font-weight: bold; color:red;'>销售代表(刘象的同学或者朋友):</span> 飞人,(刘象), 我的邮件收到了么? </li>      <li><span style='font-weight: bold; color:green;'><span style='font-weight: bold; color:green;'>刘象：</span></span>收到了啊,是个3G人才视频招聘网站，干嘛啊 </li>      <li><span style='font-weight: bold; color:red;'>销售代表(刘象的同学或者朋友):</span>兄弟，帮忙注册一份简历，我在做这个网站的推广工作。 </li>      <li><span style='font-weight: bold; color:green;'>刘象：</span>好。晚上回去弄。</li>      <li> <span style='font-weight: bold; color:red;'>销售代表(刘象的同学或者朋友):</span>快点哟，我还要去帮你拍摄个求职视频。</li>      <li><span style='font-weight: bold; color:green;'><span style='font-weight: bold; color:green;'>刘象：</span></span>好吧。为了将来找份好工作，现在准备秀。 </li>      <li><span style='font-weight: bold; color:red;'>销售代表(刘象的同学或者朋友):</span>拍好了要收你20元钱的，因为要给你的视频进行后期制作与格式转换的。</li>      <li><span style='font-weight: bold; color:green;'><span style='font-weight: bold; color:green;'>刘象：</span></span>不会吧，我不拍。</li>      <li> <span style='font-weight: bold; color:red;'>销售代表(刘象的同学或者朋友):</span>是朋友么，这点小忙都不帮？绝交。 </li>      <li><span style='font-weight: bold; color:green;'>刘象：</span>怕你了。明天拍……</li>    </ul>  </div></div><script type="text/javascript">    var prox;    var proy;    var proxc;    var proyc;	var isIe=(document.all)?true:false;	function setSelectState(state){var objl=document.getElementsByTagName('select');for(var i=0;i<objl.length;i++){objl[i].style.visibility=state;}}function mousePosition(ev){if(ev.pageX || ev.pageY){return {x:ev.pageX, y:ev.pageY};}return {x:ev.clientX + document.body.scrollLeft - document.body.clientLeft,y:ev.clientY + document.body.scrollTop - document.body.clientTop};}//关闭窗口function closeWindow(){if(document.getElementById('back')!=null){document.getElementById('back').parentNode.removeChild(document.getElementById('back'));}if(document.getElementById('mesWindow')!=null){document.getElementById('mesWindow').parentNode.removeChild(document.getElementById('mesWindow'));}if(isIe){setSelectState('');}}    function show(id,ev){/*--打开--*/	closeWindow();	var bWidth=parseInt(document.documentElement.scrollWidth);	var bHeight=parseInt(document.documentElement.scrollHeight)<592?592:parseInt(document.documentElement.scrollHeight);	if(isIe){	setSelectState('hidden');}	var back=document.createElement("div");	back.id="back";	var styleStr="top:0px;left:0px;position:absolute;background:#666;width:"+bWidth+"px;height:"+bHeight+"px;";	styleStr+=(isIe)?"filter:alpha(opacity=40);":"opacity:0.40;";	back.style.cssText=styleStr;	document.body.appendChild(back);	        clearInterval(prox); 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动画效果的弹出框，弹出时背景变灰

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