var top_nav = document.getElementById('nav_top');
if (top_nav) {
	var nav_links = top_nav.getElementsByTagName("a");
	if (nav_links) {
		for (var i = 0; i < nav_links.length; i++) {
			nav_links[i].onmouseover = shovNavSubtitle;
			nav_links[i].onmouseout = hideNavSubtitle;
		}
	}
}
		
function shovNavSubtitle(e) {
	hideNavSubtitle(null);
	if (!e) {
		e = window.event;
	}

	var target = e.srcElement ? e.srcElement : e.target;
	var div_hide = target.parentNode.getElementsByTagName("div");

	if (div_hide[0]) {
		div_hide[0].style.color = '#000';
		div_hide[0].style.display = 'block';
	}
}

function hideNavSubtitle(e) {
	var top_nav = document.getElementById('nav_top');
	if (top_nav) {
		var nav_subtitles = top_nav.getElementsByTagName("div");
		if (nav_subtitles) {
			for (var i = 0; i < nav_subtitles.length; i++) {
				nav_subtitles[i].style.color = '#FFF';
				nav_subtitles[i].style.display = 'none';
			}
		}
	}
}