resolveURL

gistfile1.js

function resolveURL(baseURL, relativeURL) {
	var html = document.implementation.createHTMLDocument("");
	var base = html.createElement("base");
	base.setAttribute("href", baseURL);
	var a = html.createElement("a");
	a.setAttribute("href", relativeURL);
	html.head.appendChild(base);
	html.body.appendChild(a);
	return a.href;
}