highlight text when text box field has focus

The following code is exact correct code

TextBox1.Attributes.Add("onFocus", "JavaScript:this.select();");

for additional

On page load event

TextBox1.Attributes.Add("onfocus", "javascript:return Highlight('" + TextBox1.ClientID + "');");



TextBox1.Attributes.Add("onblur", "javascript:return DeHighlight('" + TextBox1.ClientID + "');"); 



<script type="text/javascript" language="javascript">

	function Highlight(control)

	{

	  var mycontrol = document.getElementById(control);

	 mycontrol.className = 'Welcome';

	}

	function DeHighlight(control)

	{

	  var mycontrol = document.getElementById(control);

	  mycontrol.className = 'Bye';

	}