var ContactForm = {
  initLabels: function ()
  {
    var e = $('name');
    if (e.value.toString().strip() == '')
      e.addClassName('sender-name');
    var e = $('email');
    if (e.value.toString().strip() == '')
      e.addClassName('sender-email');
    e = $('subject');
    if (e.value.toString().strip() == '')
      e.addClassName('sender-subject');
  },

  focused: function (e)
  {
    if (e.id == 'name')
      e.removeClassName('sender-name');
    if (e.id == 'email')
      e.removeClassName('sender-email');
    if (e.id == 'subject')
      e.removeClassName('sender-subject');
  },

  blurred: function (e)
  {
    if (e.value.toString().strip() != '') return;  
    if (e.id == 'name')
      e.addClassName('sender-name');
    if (e.id == 'email')
      e.addClassName('sender-email');
    if (e.id == 'subject')
      e.addClassName('sender-subject');
    e.value = '';
  }
}