salert的提醒

<HTML>
<body>
<script language="JavaScript">
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
   titleheight=25 //提示窗口标题高度
   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;
   if (sheight<screen.height)
   {
    sheight=screen.height;
   }

   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";
   bgobj.style.zindex = "10000";
   document.body.appendChild(bgobj);

   var msgobj=document.createElement("div")
   msgobj.setAttribute("id","msgdiv");
   msgobj.setAttribute("align","center");
   msgobj.style.background="white";
   msgobj.style.border="1px solid " + bordercolor;
      msgobj.style.position = "absolute";
            msgobj.style.left = "50%";
            msgobj.style.top = "50%";
            msgobj.style.font="12px/1.6em verdana, geneva, arial, helvetica, sans-serif";
            msgobj.style.marginLeft = "-225px" ;
            msgobj.style.marginTop = -75+document.documentElement.scrollTop+"px";
            msgobj.style.width = msgw + "px";
            msgobj.style.height =msgh + "px";
            msgobj.style.textalign = "center";
            msgobj.style.lineheight = (msgh-titleheight) + "px";
            msgobj.style.zindex = "10001";

     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(){
          document.body.removeChild(bgobj);
                document.getElementById("msgdiv").removeChild(title);
                document.body.removeChild(msgobj);
                }
     document.body.appendChild(msgobj);
     document.getElementById("msgdiv").appendChild(title);
     var txt=document.createElement("p");
     txt.style.margin="1em 0"
     txt.setAttribute("id","msgtxt");
     txt.innerHTML=str;
           document.getElementById("msgdiv").appendChild(txt);
    }
salert("系统正在处理......请稍后");
</script>

</body>
</HTML>

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