update favicon dynamically

updateFavicon.js

function updateFavicon(faviconURL) {
	var src = faviconURL;
	var head_node = document.head || document.getElementsByTagName('head')[0];
	var link = document.createElement('link'),
	oldLink = document.getElementById('favicon');
	link.id = 'favicon';
	link.rel = 'shortcut icon';
	link.href = src;
	if (oldLink) {
		head_node.removeChild(oldLink);
	}
	head_node.appendChild(link);
}