Getting the width of an html element in percent % with jQuery

Question

If I alert the element which has a css selector set to width:100% I get it\'s with in px, is there some way to get it in % as

Answer 1

function percentwidth(elem){
    var pa= elem.offsetParent || elem;
    return ((elem.offsetWidth/pa.offsetWidth)*100).toFixed(2)+'%';
}