function text_swich(idname){
	
	document.getElementById("aufbau").style.display = "none";
	//document.getElementById("integration").style.display = "none";
	document.getElementById("vermarktung").style.display = "none";
	//document.getElementById("werbung_innerhalb").style.display = "none";
	//document.getElementById("werbung_ausserhalb").style.display = "none";
	document.getElementById("vorteile").style.display = "none";
	document.getElementById("merkmale").style.display = "none";
	document.getElementById("bereiche").style.display = "none";
	
	document.getElementById(idname).style.display = "block";
	
	
	document.getElementById("aufbau_lnk").style.fontWeight = "normal";
	//document.getElementById("integration_lnk").style.fontWeight = "normal";
	document.getElementById("vermarktung_lnk").style.fontWeight = "normal";
	//document.getElementById("werbung_innerhalb_lnk").style.fontWeight = "normal";
	//document.getElementById("werbung_ausserhalb_lnk").style.fontWeight = "normal";
	document.getElementById("vorteile_lnk").style.fontWeight = "normal";
	document.getElementById("merkmale_lnk").style.fontWeight = "normal";
	document.getElementById("bereiche_lnk").style.fontWeight = "normal";	
	
	document.getElementById(idname+"_lnk").style.fontWeight = "bold";
	
	
	document.getElementById("aufbau_img").src = "images/arrow_black.gif";
	//document.getElementById("integration_img").src = "images/arrow_black.gif";
	document.getElementById("vermarktung_img").src = "images/arrow_black.gif";
	//document.getElementById("werbung_innerhalb_img").src = "images/arrow_black.gif";
	//document.getElementById("werbung_ausserhalb_img").src = "images/arrow_black.gif";
	document.getElementById("vorteile_img").src = "images/arrow_black.gif";
	document.getElementById("merkmale_img").src = "images/arrow_black.gif";
	document.getElementById("bereiche_img").src = "images/arrow_black.gif";
		
	document.getElementById(idname+"_img").src = "images/arrow_white.gif";
}