function activate(div){
	
	var main_navi = new Array();
	main_navi["nav1"] = "inactive";
	main_navi["nav2"] = "inactive";
	main_navi["nav3"] = "inactive";
	main_navi["nav4"] = "inactive";
	main_navi["nav5"] = "inactive";
	
	for (var i in main_navi) {
		if (i == div) {
			// Hauptmenü-punkt aktivieren
			document.getElementById(div).className = "active";
		};
	}
}