var domTT_styleClass = 'tooltip';

var rules = {

  '.piptime': function(el) {
    el.onmouseover = function(event) {
      new Ajax.Updater (
        'pt-tooltip-content',
        '/ajax_convert_piptime.cgi',
        {
          method     : 'get',
          parameters : 'pt=' + el.innerHTML
        }
      );
      domTT_activate (
        el, 
        event, 
        'content', $('pt-tooltip-content'),
        'x',       el.offsetLeft + 8,
        'y',       el.offsetTop  + 2,
        'trail',   'x'
      );
    };
  }

};

Behaviour.register(rules);