Tooltips from title="" attributes

tooltips

(function(doc, undefined){
    var e = doc.querySelectorAll('a.tooltip'), s;

    if(e !== undefined){
        for(i=0;i<e.length;++i){
            s = document.createElement('span'),
            s.className='tooltip',
            s.innerHTML = e[i].getAttribute('title'),      
            s.style.padding = '0 15px';

            e[i].appendChild(s);

            s.style.margin = (((parseInt(s.offsetHeight) / 2) + (parseInt(e[i].offsetHeight) / 2))) +'px 0 0 -' + ((parseInt(s.offsetWidth) / 2) + (parseInt(e[i].offsetWidth) / 2)) +'px';         
            e[i].removeAttribute('title');
        }
    }
})(document);