iterate through class.js

var getElementsByClassName = function(e, s, t) {
		return (getElementsByClassName = document.getElementsByClassName ? function(e, s, t) {
					for (var a, n = (t = t || document)
							.getElementsByClassName(e), c = s ? new RegExp("\\b" + s + "\\b", "i") : null, r = [], l = 0, i = n.length; l < i; l += 1) a = n[l], c && !c.test(a.nodeName) || r.push(a);
					return r
				} : document.evaluate ? function(e, s, t) {
					s = s || "*", t = t || document;
					for (var a, n, c = e.split(" "), r = "", l = "http://www.w3.org/1999/xhtml", i = document.documentElement.namespaceURI === l ? l : null, o = [], u = 0, h = c.length; u < h; u += 1) r += "[contains(concat(' ', @class, ' '), ' " + c[u] + " ')]";
					try {
						a = document.evaluate(".//" + s + r, t, i, 0, null)
					} catch (m) {
						a = document.evaluate(".//" + s + r, t, null, 0, null)
					}
					for (; n = a.iterateNext();) o.push(n);
					return o
				} : function(e, s, t) {
					s = s || "*", t = t || document;
					for (var a, n, c = e.split(" "), r = [], l = "*" === s && t.all ? t.all : t.getElementsByTagName(s), i = [], o = 0, u = c.length; o < u; o += 1) r.push(new RegExp("(^|\\s)" + c[o] + "(\\s|$)"));
					for (var h = 0, m = l.length; h < m; h += 1) {
						a = l[h], n = !1;
						for (var g = 0, d = r.length; g < d && (n = r[g].test(a.className)); g += 1);
						n && i