Polyfill for getElementsByClassName

findElementsByClass.js

function findElementsByClass(className) {
    var result = [],
        elements = document.getElementsByTagName("*"),
        classes;

    for (var i = 0, ilen = elements.length; i < ilen; i+=1) {
        if (elements[i].className !== "") {
            classes = elements[i].className.split(" ");
            for (j = 0, jlen = classes.length; j < jlen; j+=1) {
                if (classes[j] === className) {
                    result.push(elements[i]);
                    break;
                }
            }
        }
     }
     
    return result;
}