Event.observe(window, 'load', init, false);

function donothing() {}

function init(){
  donothing()
}

function rot13(field) {
     var url = 'http://rogerlew.geekgalaxy.com/rot13.php';
     var pars = 'string='+field.firstChild.data
     var target = field;
     var myAjax = new Ajax.Updater(target, url, {method: 'post',
                                                 parameters: pars});
}