If TextBox is empty, it displays a message to the user. Once the user has typed some text into the TextBox, the watermarked appearance goes away.
<body>
<form>
<input type="text" size="25" value="Enter Your Text Here" onfocus="if(this.value == 'Enter Your Text Here'){this.value = '';}" onblur="if (this.value == ''){this.value = 'Enter Your Text Here';}" />
<input type="submit" value="Submit" />
</form>
</body>