怎么在显示div的同时让页面的其它部分处于不可用状态，就像显示成灰色的那样，也不能相应鼠标点击事件，谢谢
------解决方案--------------------------------------------------------
<HTML> <HEAD>
<META content= "MSHTML 6.00.2800.1586 " name=GENERATOR> </HEAD>
<BODY> <INPUT onclick= "sAlert( '正在导入... <br/> 正在将Word文档导入到编辑器,请稍候... <br/> XXXXXXX科技发展有限公司 '); " type=button value=点击这里>
<SCRIPT language=javascript type=text/javascript>
//Author:Daviv
//Blog: <a href= " <a href= "http://blog.163.com/jxdawei " target= "_blank "> http://blog.163.com/jxdawei </a> " target= "_blank "> <a href= "http://blog.163.com/jxdawei " target= "_blank "> http://blog.163.com/jxdawei </a> </a>
//Date:2006-10-28
//Email:jxdawei@gmail.com
function sAlert(str){
var msgw,msgh,bordercolor;
msgw=400;//提示窗口的宽度
msgh=100;//提示窗口的高度
bordercolor= "#336699 ";//提示窗口的边框颜色
titlecolor= "#99CCFF ";//提示窗口的标题颜色
var sWidth,sHeight;
sWidth=document.body.offsetWidth;
sHeight=document.body.offsetHeight;
var bgObj=document.createElement( "div ");
bgObj.setAttribute( 'id ', 'bgDiv ');
bgObj.style.position= "absolute ";
bgObj.style.top= "0 ";
bgObj.style.background= "#777 ";
bgObj.style.filter= "progid:DXImageTransform.Microsoft.Alpha(style=3,opacity=25,finishOpacity=75 ";
bgObj.style.opacity= "0.6 ";
bgObj.style.left= "0 ";
bgObj.style.width=sWidth + "px ";
bgObj.style.height=sHeight + "px ";
document.body.appendChild(bgObj);
var msgObj=document.createElement( "div ")
msgObj.setAttribute( "id ", "msgDiv ");
msgObj.setAttribute( "align ", "center ");
msgObj.style.position= "absolute ";
msgObj.style.background= "white ";
msgObj.style.font= "12px/1.6em Verdana, Geneva, Arial, Helvetica, sans-serif ";
msgObj.style.border= "1px solid " + bordercolor;
msgObj.style.width=msgw + "px ";
msgObj.style.height=msgh + "px ";
msgObj.style.top=(document.documentElement.scrollTop + (sHeight-msgh)/2) + "px ";
msgObj.style.left=(sWidth-msgw)/2 + "px ";
var title=document.createElement( "h4 ");
title.setAttribute( "id ", "msgTitle ");
title.setAttribute( "align ", "right ");
title.style.margin= "0 ";
title.style.padding= "3px ";
title.style.background=bordercolor;
title.style.filter= "progid:DXImageTransform.Microsoft.Alpha(startX=20, startY=20, finishX=100, finishY=100,style=1,opacity=75,finishOpacity=100); ";
title.style.opacity= "0.75 ";
title.style.border= "1px solid " + bordercolor;
title.style.height= "18px ";
title.style.font= "12px Verdana, Geneva, Arial, Helvetica, sans-serif ";
title.style.color= "white ";
title.style.cursor= "pointer ";
title.innerHTML= "关闭 ";
title.onclick=function(){