function changeCss()
{
	var current = new Date();
	var currentHour = current.getHours();
	if(currentHour >= 18 || currentHour < 5)
	{
		var newCSS = document.createElement('link');
		newCSS.setAttribute("rel", "stylesheet");
		newCSS.setAttribute("type", "text/css");
		newCSS.setAttribute("href", "/eng/css/nobanner_night.css");
		document.getElementsByTagName("head")[0].appendChild(newCSS);
	}
}

changeCss();