DIV+CSS+JS 变灰弹出层

浮动层居中的对话框效果演示

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3c.org/TR/1999/REC-html401-19991224/loose.dtd"> 
<HTML xml:lang="zn" xmlns="http://www.w3.org/1999/xhtml"> 
<HEAD> 
<TITLE>浮动层居中的对话框效果演示</TITLE> 
<FCK:META http-equiv=content-type content="application/xhtml+xml; charset=gb2312" /> 
<STYLE type=text/css> 
HTML { 
HEIGHT: 100% 
} 
BODY { 
HEIGHT: 100% 
} 
BODY { 
FONT-SIZE: 14px; FONT-FAMILY: Tahoma, Verdana, sans-serif 
} 
DIV.neat-dialog-cont { 
Z-INDEX: 98; BACKGROUND: none transparent scroll repeat 0% 0%; LEFT: 0px; WIDTH: 100%; POSITION: absolute; TOP: 0px; HEIGHT: 100% 
} 
DIV.neat-dialog-bg { 
Z-INDEX: -1; FILTER: alpha(opacity=70); LEFT: 0px; WIDTH: 100%; POSITION: absolute; TOP: 0px; HEIGHT: 100%; BACKGROUND-COLOR: #eee; opacity: 0.7 
} 
DIV.neat-dialog { 
BORDER-RIGHT: #555 1px solid; BORDER-TOP: #555 1px solid; Z-INDEX: 99; MARGIN-LEFT: auto; BORDER-LEFT: #555 1px solid; WIDTH: 30%; MARGIN-RIGHT: auto; BORDER-BOTTOM: #555 1px solid; POSITION: relative; TOP: 25%; BACKGROUND-COLOR: #fff 
} 
DIV.neat-dialog-title { 
PADDING-RIGHT: 0.3em; PADDING-LEFT: 0.3em; FONT-SIZE: 0.8em; PADDING-BOTTOM: 0.1em; MARGIN: 0px; LINE-HEIGHT: 1.2em; PADDING-TOP: 0.1em; BORDER-BOTTOM: #444 1px solid; POSITION: relative 
} 
IMG.nd-cancel { 
RIGHT: 0.2em; POSITION: absolute; TOP: 0.2em 
} 
DIV.neat-dialog P { 
PADDING-RIGHT: 0.2em; PADDING-LEFT: 0.2em; PADDING-BOTTOM: 0.2em; PADDING-TOP: 0.2em; TEXT-ALIGN: center 
} 
</STYLE> 
<SCRIPT type=text/javascript> 
function NeatDialog(sHTML, sTitle, bCancel) 
{ 
window.neatDialog = null; 
this.elt = null; 
if (document.createElement && document.getElementById) 
{ 
var dg = document.createElement("div"); 
dg.className = "neat-dialog"; 
if (sTitle) 
sHTML = ''+sTitle+ 
((bCancel)? 
'<img src="http://img.gxlcms.com/x.gif" alt="Cancel" class="nd-cancel" />':'')+ 
'\n' + sHTML; 
dg.innerHTML = sHTML;

var dbg = document.createElement("div"); 
dbg.id = "nd-bdg"; 
dbg.className = "neat-dialog-bg";

var dgc = document.createElement("div"); 
dgc.className = "neat-dialog-cont"; 
dgc.appendChild(dbg); 
dgc.appendChild(dg);

//adjust positioning if body has a margin 
if (document.body.offsetLeft > 0) 
dgc.style.marginLeft = document.body.offsetLeft + "px";

function openDialog() 
{

var sHTML = '<p>你现在看到的是一个层窗口，是被JS控制弹出的，www.gxlcms.com脚本之家！</p>'+ 
'<p><button onclick="window.neatDialog.close()">关闭</button></p>'; 
new NeatDialog(sHTML, "欢迎光临!", false);

}

</SCRIPT> 
<BODY> 
<H1>浮动层居中的效果</H1> 
<BUTTON onclick=openDialog()>点此演示效果</BUTTON> 
</BODY></HTML>

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]