function change_content(new_content,menu_id) {
		if(menu_id!="") {
	/* inaktive Menüpunkte grau färben */	
			for(i=1;i<7;i++) if (document.getElementById("topmenu_"+i).className == "topmenu_aktiv") {
				document.getElementById("topmenu_"+i).className = ""; 
				document.getElementById("topmenu_"+i).style.background = '#e2e2e2';
			}
	/* aktiven Menüpunkt weiß färben */
			var current_menu = "topmenu_" + menu_id;
			document.getElementById(current_menu).className = "topmenu_aktiv";
			document.getElementById(current_menu).style.background = '#ffffff';
	/* Navigationsbild erneuern */
			document.all.bild.style.background = 'url(images/layout/bild_' + new_content + '.jpg)';
		}
	/* versteckten iFrame füllen */
		var page = new_content + ".htm";
		contentframe.document.location.href = "pages/" + page;
	}
	
	function change_display(which_td) {
	/* Inhalt des versteckten iFrame anzeigen */
		if(which_td == "small") document.all.content_small.innerHTML = contentframe.document.body.innerHTML;
		else document.all.content.innerHTML = contentframe.document.body.innerHTML;
	}
	
	function mo(menu_id,status) {
	/* MouseOver bzw. MouseOut der Menüpunkte */
		var current_menu = "topmenu_" + menu_id;
		if (document.getElementById(current_menu).className != "topmenu_aktiv") {
			if (status==1) document.getElementById(current_menu).style.background = '#ffffff';
			else document.getElementById(current_menu).style.background = '#e2e2e2';
		}
	}
	
	function start(menu_id) {
		if(menu_id && menu_id!="") {
	/* aktiven Menüpunkt weiß färben */
			var current_menu = "topmenu_" + menu_id;
			document.getElementById(current_menu).className = "topmenu_aktiv";
			document.getElementById(current_menu).style.background = '#ffffff';
		} else {
			var current_menu = "topmenu_1";
			document.getElementById(current_menu).className = "topmenu_aktiv";
			document.getElementById(current_menu).style.background = '#ffffff';
		}
	}