js 鼠标点击文本框提示文字消失

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>鼠标点击文本框 提示文字消失</title>
</head>

<body>
<input onblur="this.style.color='#999';if(this.value=='') this.value='请填写信息！';" 
onkeyup="if(event.keyCode==13){doSearch();}" onfocus="this.style.color='#000';if(this.value=='请填写信息！') this.value='';" value="请填写信息！"  maxLength=60 size=12 name="keyword" id="search_keyword" style="width:200px;height:30px;color:#999">
</body>
</html>

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