为TextBox装饰水印与(blur和focus)事件应用

<script type="text/javascript"> 
var watermarkText = "输入名称"; 
function WaterMarkOnBlur(textbox) { 
if (textbox.value.length == 0) { 
textbox.style.color = "gray"; 
textbox.value = watermarkText; 
} 
} 
function WaterMartOnfocus(textbox) 
{ 
if (textbox.value == watermarkText) { 
textbox.style.color = "black"; 
textbox.value = ""; 
} 
} 
</script>

<asp:TextBox ID="TextBox1" runat="server" Text="输入名称" 
ForeColor="Gray" onblur="WaterMarkOnBlur(this);" 
onfocus="WaterMartOnfocus(this);"> 
</asp:TextBox>