function aktiv(){

var art = document.getElementById('unternehmen').value;


	if(art =="Agentur")
	{
	document.getElementById('auftraggeber').disabled = false;
	document.getElementById('ansprechpartner').disabled = false;
	document.getElementById('email_ansprechpartner').disabled = false;
	document.getElementById('tel_ansprechpartner').disabled = false;
	
	document.getElementById('label_auftraggeber').className = "label_press";
	document.getElementById('label_ansprechpartner').className = "label_press";
	document.getElementById('label_email_ansprechpartner').className = "label_press";
	document.getElementById('label_tel_ansprechpartner').className = "label_press";
	
	
	
	}
	else 
	{
	document.getElementById('auftraggeber').disabled = true;
	document.getElementById('ansprechpartner').disabled = true;
	document.getElementById('email_ansprechpartner').disabled = true;
	document.getElementById('tel_ansprechpartner').disabled = true;
	
	document.getElementById('label_auftraggeber').className = "label_press_un";
	document.getElementById('label_ansprechpartner').className = "label_press_un";
	document.getElementById('label_email_ansprechpartner').className = "label_press_un";
	document.getElementById('label_tel_ansprechpartner').className = "label_press_un";
	
	}

}