js --- 单击按钮出现对话框代码(透明)

<script>  
function msg(info){  
var p=document.createElement("DIV");  
if (!info) var info='^_^ 谢谢捧场！！';  
p.id="p";  
p.style.position="absolute";  
p.style.width=document.body.scrollWidth;  
p.style.height=(document.body.offsetHeight>document.body.scrollHeight)?'100%':document.body.scrollHeight;  
p.style.zIndex='998';  
p.style.top='0px';  
p.style.left='0%';  
p.style.backgroundColor="gray";  
p.style.opacity='0.5';  
p.style.filter="alpha(opacity=80)";  
document.body.appendChild(p);  
var p1=document.createElement("DIV");  
var top=parseInt(parseInt(document.body.scrollHeight)*0.25)+document.body.scrollTop;  
p1.style.position="absolute";  
p1.style.width="300px";  
p1.id="p1";  
var left=Math.ceil(((document.body.scrollWidth)-parseInt(p1.style.width.replace('px','')))/2)+document.body.scrollLeft;  
p1.style.height="200px";  
p1.style.zIndex='999';    
p1.style.top=top+'px';  
p1.style.left=left+'px';  
p1.style.border="0px solid red";  
var html="";  
html+="<center>" 
html+="<div class='p3' style='height:1px;overflow:hidden;background:red;width:294px;border-left:1px solid red;border-right:1px solid red;'></div>" 
html+="<div class='p2' style='height:1px;overflow:hidden;background:red;width:296px;border-left:1px solid red;border-right:1px solid red;'></div>" 
html+="<div class='p2' style='height:1px;overflow:hidden;background:red;width:298px;border-left:1px solid red;border-right:1px solid red;'></div>" 
html+="<div class='p1' style='height:20px;overflow:hidden;background:red;width:300px;border-left:1px solid red;border-right:1px solid red;color:#fff;font-size:9pt;font-weight:bold;text-align:left;'> ⊙ 提示</div>" 
html+="<div id='c' style='height:150px;width:300px;background-color:#FEEACB;overflow:hidden;border-left:1px solid red;border-right:1px solid red;padding-top:40px;font-size:9pt;'>"+info+"<br><br><br>[ <a href='javascript:this.cancle()'>关闭</a> ]</div>" 
html+="<div class='p1' style='height:1px;overflow:hidden;background:#FEEACB;width:298px;border-left:1px solid red;border-right:1px solid red;'></div>" 
html+="<div class='p2' style='height:1px;overflow:hidden;background:#FEEACB;width:296px;border-left:1px solid red;border-right:1px solid red;'></div>" 
html+="<div class='p3' style='height:1px;overflow:hidden;background:red;width:294px;border-left:1px solid red;border-right:1px solid red'></div>" 
html+="</center>" 
document.body.appendChild(p1);  
p1.innerHTML=html;  
var arr=document.getElementsByTagName("select");  
var i=0;  
while(i<arr.length){  
   arr[i].style.visibility='hidden';  
   i++;  
}  
this.cancle=function(){  
   document.body.removeChild(document.getElementById('p'));  
   document.body.removeChild(document.getElementById('p1'));  
   var arr=document.getElementsByTagName("select");  
   var i=0;  
   while(i<arr.length){  
   arr[i].style.visibility='visible';  
   i++;  
   }  
}  
}
</script>  
<input value='shout Down' type='button' onClick='msg()' />