自动关闭的层

下面为效果显示

注　册　　登　入

(此视窗将于 5 秒后自动关闭)

脚本说明:
把如下代码加入<body>区域中
<SCRIPT language=JavaScript>
timePopup=5;var ns=(document.layers);var ie=(document.all);var w3=(document.getElementById && !ie);adCount=0;
function initPopup(){if(!ns && !ie && !w3) return;if(ie) adDiv=eval('document.all.lbplocation.style');else if(ns) adDiv=eval('document.layers["lbplocation"]');else if(w3) adDiv=eval('document.getElementById("lbplocation").style');if (ie||w3) adDiv.visibility="visible";else adDiv.visibility ="show";showPopup();}
function showPopup(){if(adCount<timePopup*10){adCount+=1;if (ie){documentWidth  =document.body.offsetWidth/2+document.body.scrollLeft-20;documentHeight =document.body.offsetHeight/2+document.body.scrollTop-20;} else if (ns){documentWidth=window.innerWidth/2+window.pageXOffset-20;documentHeight=window.innerHeight/2+window.pageYOffset-20;} else if (w3){documentWidth=self.innerWidth/2+window.pageXOffset-20;documentHeight=self.innerHeight/2+window.pageYOffset-20;} adDiv.left=documentWidth-250;adDiv.top =documentHeight-150; setTimeout("showPopup()",100);}else closePopup();}
function closePopup(){if (ie||w3) adDiv.display="none"; else adDiv.visibility ="hide";}
onload=initPopup;
</SCRIPT>
<DIV id=lbplocation style="HEIGHT: 1px; LEFT: 50px; POSITION: absolute; TOP: 100px; VISIBILITY: hidden; WIDTH: 1px">
            <TABLE bgColor=#35726c height=320 
            style="BORDER-BOTTOM: #ecf6f5 1px outset; BORDER-LEFT: #ecf6f5 1px outset; BORDER-RIGHT: #ecf6f5 1px outset; BORDER-TOP: #ecf6f5 1px outset" 
            width=520>
              <TBODY>
              <TR>
                <TD>
                  <TABLE align=center bgColor=#83c6c0 height=290 
                  style="BORDER-BOTTOM: #fafdfd 1px inset; BORDER-LEFT: #fafdfd 1px inset; BORDER-RIGHT: #fafdfd 1px inset; BORDER-TOP: #fafdfd 1px inset" 
                  width=490>
                    <TBODY>
                    <TR>
                      <TD align=middle vAlign=center><BR><BR><B><A 
                        href="register.cgi" 
                        title=按这里进行注册><U>注　册</U></A>　　<A 
                        href="loginout.cgi?forum=44" 
                        title=从这里开始进入论坛><U>登　入</U></A></B>
                        <P>(此视窗将于 5 秒后自动关闭)</P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></DIV>