public void AddBackofficeBottom(string urlstring, IUrlHelper url, IHtmlHelper html)
{
const string prefix = @"~/Areas/Backoffice/Scripts/framework/";
urlstring = urlstring.TrimStart('/');
var path = string.Format("{0}{1}", url.Content(prefix), (urlstring.EndsWith(".js") ? urlstring : urlstring + ".js"));
html.Statics().FooterScripts.Add(path);
}