$(document).ready(function() 
  {
    if (document.getElementById('txtUsername') != null && document.getElementById('txtUsername').value == 'Username')
    {
      document.getElementById('txtUsername').value = '';
    }
    if (document.getElementById('txtPassword') != null && document.getElementById('txtPassword').value == 'Password')
    {
      document.getElementById('txtPassword').value = '';
    }
    $('input:text').hint();
  });