private void WriteOpening()
{
var navAttrs = new HtmlAttributes(new {@class = "navbar navbar-default", role = "navigation"});
if (_settings.Fixed == FixedPosition.Top) navAttrs["class"] += "navbar-fixed-top";
else if (_settings.Fixed == FixedPosition.Bottom) navAttrs["class"] += "navbar-fixed-bottom";
if (_settings.Inverse) navAttrs["class"] += "navbar-inverse";
Write("<nav {0}>", navAttrs.ToString());
if (_settings.UseInnerContainer) Write("<div class=\"container\">");
}