Extracts base URL from location of current document.

extractBaseUrl

// Extracts base URL from location of current document.
function extractBaseUrl() {
	// Get URL without query path
	var url = [location.protocol, '//', location.host, location.pathname].join('');
	// Remove filename if present
	var f = url.substr(url.lastIndexOf("/") + 1).toLowerCase();
	if (f.indexOf('.html') >= 0 || f.indexOf('.htm') >= 0 || f.indexOf('.php')) {
		url = url.substr(0, url.length - f.length);
	}
	// Add last slash if missing
	if (url == '' || url[url.length - 1] != '/') url += '/';
	return url;
}