// JavaScript Document

function nav1(){
	document.getElementById('nav_1').src="img/navi_biosa_balance_hover.jpg";
	document.getElementById('nav_2').src="img/navi_kraft_von_innen.jpg";
	document.getElementById('nav_3').src="img/navi_unternehmen.jpg";
	document.getElementById('nav_4').src="img/navi_wissenswertes.jpg";
   	document.getElementById('sub_1').style.display="block";
   	document.getElementById('sub_2').style.display="none";   
   	document.getElementById('sub_3').style.display="none";   
   	document.getElementById('sub_4').style.display="none";         
}
function nav2(){
	document.getElementById('nav_1').src="img/navi_biosa_balance.jpg";
	document.getElementById('nav_2').src="img/navi_kraft_von_innen_hover.jpg";
	document.getElementById('nav_3').src="img/navi_unternehmen.jpg";
	document.getElementById('nav_4').src="img/navi_wissenswertes.jpg";
	document.getElementById('sub_1').style.display="none";
   	document.getElementById('sub_2').style.display="block";   
   	document.getElementById('sub_3').style.display="none";   
   	document.getElementById('sub_4').style.display="none";         
}
function nav3(){
	document.getElementById('nav_1').src="img/navi_biosa_balance.jpg";
	document.getElementById('nav_2').src="img/navi_kraft_von_innen.jpg";
	document.getElementById('nav_3').src="img/navi_unternehmen_hover.jpg";
	document.getElementById('nav_4').src="img/navi_wissenswertes.jpg";
	document.getElementById('sub_1').style.display="none";
   	document.getElementById('sub_2').style.display="none";   
   	document.getElementById('sub_3').style.display="block";   
   	document.getElementById('sub_4').style.display="none";         
}
function nav4(){
	document.getElementById('nav_1').src="img/navi_biosa_balance.jpg";
	document.getElementById('nav_2').src="img/navi_kraft_von_innen.jpg";
	document.getElementById('nav_3').src="img/navi_unternehmen.jpg";
	document.getElementById('nav_4').src="img/navi_wissenswertes_hover.jpg";
   	document.getElementById('sub_1').style.display="none";
   	document.getElementById('sub_2').style.display="none";   
   	document.getElementById('sub_3').style.display="none";   
   	document.getElementById('sub_4').style.display="block";         
}
function topnavi(){
	document.getElementById('nav_1').src="img/navi_biosa_balance.jpg";
	document.getElementById('nav_2').src="img/navi_kraft_von_innen.jpg";
	document.getElementById('nav_3').src="img/navi_unternehmen.jpg";
	document.getElementById('nav_4').src="img/navi_wissenswertes.jpg";
   	document.getElementById('sub_1').style.display="none";
   	document.getElementById('sub_2').style.display="none";   
   	document.getElementById('sub_3').style.display="none"; 
   	document.getElementById('sub_4').style.display="none"; 	
}