function chargerPrototip(){
  $$('a[rel]').each(function(element) {
    new Tip(element, element.rel, {
	  style: 'clefs',
	  stem: 'topLeft',
	  hook: { tip: 'topLeft', mouse: true },
	  offset: { x: 5, y: 5 }
	});
  });
  $$('a.tip').each(function(element) {
    new Tip(element, element.down('span').innerHTML, {
	  style: 'clefs',
	  stem: 'topLeft',
	  hook: { tip: 'topLeft', mouse: true },
	  offset: { x: 5, y: 5 }
	});
  });
}