<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script type="text/javascript">
function marker(x) {
if (x.value == "请录入反馈信息") {
x.value = "";
x.style.backgroundColor = "#F0F0F0";
x.style.color = "red";
}
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<input type="text" id="button1" value="请录入反馈信息" onclick="marker(this)" />
</div>
</form>
</body>
</html>