function toggleSubscribeBilling() {
  if(!document.getElementById) return;
  var bill_sameas = document.getElementById('bill_sameas')
  var style
  if (document.getElementById('is_gift').checked) {
    bill_sameas.checked = false
    bill_sameas.disabled = true;
  } else {
    bill_sameas.disabled = false;
  }
  if (bill_sameas.checked) {
    style = 'none'
  } else {
    style = 'block'
  }

  document.getElementById('billinfo').style.display = style

}

function toggleSubscribeGiftMessage() {
  if(!document.getElementById) return;
  var is_gift = document.getElementById('is_gift')
  var style
  var giftmessage = document.getElementById('giftmessage')
  
  if (document.getElementById('is_gift').checked) {
     giftmessage.style.display = 'inline';
  } else {
      giftmessage.style.display = 'none';
  }

}


function limit_textarea(field, maxlen) {
if (field.value.length > maxlen) {
field.value = field.value.substring(0, maxlen);
} }

/*
<!-- Original:  Cyanide_7 (leo7278@hotmail.com) -->
<!-- Web Site:  http://members.xoom.com/cyanide_7 -->

<!-- This script and many more are available free online at -->
<!-- The JavaScript Source!! http://javascript.internet.com -->
*/
var isNN = (navigator.appName.indexOf("Netscape")!=-1);
function autoTab(input,len, e) {
  var keyCode = (isNN) ? e.which : e.keyCode;
  var filter = (isNN) ? [0,8,9] : [0,8,9,16,17,18,37,38,39,40,46];
  if(input.value.length >= len && !containsElement(filter,keyCode)) {
  input.value = input.value.slice(0, len);
  input.form[(getIndex(input)+1) % input.form.length].focus();
  }
  function containsElement(arr, ele) {
  var found = false, index = 0;
  while(!found && index < arr.length)
  if(arr[index] == ele)
  found = true;
  else
  index++;
  return found;
  }
  function getIndex(input) {
  var index = -1, i = 0, found = false;
  while (i < input.form.length && index == -1)
  if (input.form[i] == input)index = i;
  else i++;
  return index;
  }
  return true;
}