// Global agent variables
var ua =		navigator.userAgent.toLowerCase();
var ie =		((ua.indexOf("msie") != -1) && (ua.indexOf("opera") == -1) && (ua.indexOf("webtv") == -1));
var ns =		(navigator.appName == 'Netscape');
var	gecko = 	(ua.indexOf("gecko") != -1);
var	safari = 	(ua.indexOf("safari") != -1);
var	konqueror = (ua.indexOf("konqueror") != -1);
var win =		(ua.indexOf('win') != -1);
var mac =		(ua.indexOf('macintosh') != -1);
var linux =		(ua.indexOf('linux') != -1);
var version =	navigator.appVersion;
var navbar;

//is IE6?

if (version.indexOf('MSIE') != -1 && version.indexOf('6.0') != -1) {
	var is_ie6 = true;
}

function navigation(nav) {

	if (ie) {
		navbar = document.getElementById("menu_nav").childNodes;
	} else {
		navbar = document.getElementById("menu_nav").childNodes;
	}

	for (i=0; navbar[i]; i++) {
		if (navbar[i].id == "nav"+nav) {
			navbar[i].className = "menu_nav_active";
		} else {
			navbar[i].className = 'menu_nav_inactive';
		}
	}

	navbar = document.getElementById("menu_lower").childNodes;
	for (i=0; navbar[i]; i++) {
		if (navbar[i].id == "top_nav_sec"+nav) {
			navbar[i].style.display = "block";
		} else {
			navbar[i].style.display = "none";
		}
	}

	return false;

}