function setFocus(tag) {
  document.forms[1].elements[tag].focus();
}

function on(tag) { document.forms['unsubscribe'].elements[tag].style.background=('#fff'); }

function off(tag) { document.forms['unsubscribe'].elements[tag].style.background=('#eee'); }

function btnOn(tag) {
  document.forms[1].elements[tag].style.background=('#fff');
  document.forms[1].elements[tag].style.color=('#666');
  document.forms[1].elements[tag].style.border=('solid 1px #eee');
}

function btnOff(tag) {
  document.forms[1].elements[tag].style.background=('#d0c5af');
  document.forms[1].elements[tag].style.color=('#fff');
  document.forms[1].elements[tag].style.border=('solid 1px #666');
}

function setForm() {
  for (var i=1; i<document.forms[1].elements.length-1; i++) {
    off(i);
  }
  setFocus(0);
}

function validate(){
  var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
  if (document.forms['unsubscribe'].elements['email'].value.indexOf(".") == "-1") {
    alert("Please enter your valid e-mail address");
    setFocus('email');
    return false;
  } else if (!filter.test(document.forms['unsubscribe'].elements['email'].value)){
    alert("Please enter one valid email address");
    setFocus('email');
    return false;
  } 
  return true;
}