document.observe('dom:loaded', function() {
  $$('.tooltip').each(function(element) {
    ToolTipContent = $$('#'+element.rel)[0].cloneNode(true);
    if(ToolTipContent.childNodes.length > 0) {
        new Tip(element, ToolTipContent, { 
                                            width: 'auto'
                                            , hook: { tip: 'topMiddle', mouse: true }
                                            , offset: { x: 7, y: 18 }
                                            , stem: 'topMiddle'
                                            , title: element.text
                                        });
        $$('#'+element.rel)[0].style.display = "none";
    }

  });
});