文本框点击时文字消失脚本

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta name="keywords" content="站长,网页特效,js特效,广告代码,盼盼,panpan.org,panpan,www.panpan.org,站长特效网" />
<meta name="description" content="www.panpan.org,盼盼的家园，站长必备js特效及广告代码。大量高质量js特效" />
<title>使文本框点击时文字消失脚本，盼盼的家园(www.panpan.org)整理收集</title>
</head>
<body>
<input type="text" value="初始内容" id="myinput" size="60" />
</body>
</html>
<script language="JavaScript" type="text/javascript">
   function addListener(element,e,fn){
        if(element.addEventListener){
             element.addEventListener(e,fn,false);
         } else {
             element.attachEvent("on" + e,fn);
          }
   }//欢迎来到盼盼的家园，我们的网址是www.panpan.org，很好记。
   var myinput = document.getElementById("myinput");
   addListener(myinput,"click",function(){
    myinput.value = "";
   })
   addListener(myinput,"blur",function(){
    myinput.value = "点击后内容";
   })
</script>