Drupal.behaviors.token = function() {
  // keep track of field focus
  $('textarea, input[type="text"]').focus(function() {
    Drupal.settings.tokenlastfocus = this;
  });
  $('span.token-key').each(function(){
    var newThis = $('<a href="javascript:void(0);" title="' + Drupal.t('Insert this token into your form') + '">'+ $(this).html() +'</a>').click(function(){
      if (typeof Drupal.settings.tokenlastfocus != 'undefined') {
        var myField = Drupal.settings.tokenlastfocus;
        var myValue = $(this).text();
        
        //IE support
        if (document.selection) {
          myField.focus();
          sel = document.selection.createRange();
          sel.text = myValue;
        }

        //MOZILLA/NETSCAPE support
        else if (myField.selectionStart || myField.selectionStart == '0') {
          var startPos = myField.selectionStart;
          var endPos = myField.selectionEnd;
          myField.value = myField.value.substring(0, startPos)
                        + myValue
                        + myField.value.substring(endPos, myField.value.length);
        } else {
          myField.value += myValue;
        }
        
        $('html,body').animate({scrollTop: $(myField).offset().top}, 500);
      }
      return false;
    });
    $(this).replaceWith(newThis);
  });
}