自定義alert效果

<input type="button" value="點擊這裏" onclick="sAlert('測試效果<br>還可以直接書寫HTML代碼 <br>© 2006');" />   
   
<script type="text/javascript" language="javascript">...   
//Author:Daviv    
//Blog:<a href="http://blog.163.com/jxdawei" target="_blank">http://blog.163.com/jxdawei</a>   
//Date:2006-10-28    
//Email:[email protected]    
            function sAlert(str)...{    
            var msgw,msgh,bordercolor;    
            msgw=400;//提示窗口的寬度    
            msgh=100;//提示窗口的高度    
            bordercolor="#336699";//提示窗口的邊框顏色    
            titlecolor="#99CCFF";//提示窗口的標題顏色    
                
            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="關閉";    
          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);    
      }    
        </script>