$(document).ready(function(){
$("#astart").hover(function(){

$('#nstart').css("backgroundPosition","0 -50px");
 }, function(){if(link1==false){
  $('#nstart').css("backgroundPosition", '0 0');
 }
 });
 
 $("#aunfall").hover(function(){
$('#nunfall').css("backgroundPosition","0 -49px");
 }, function(){if(link2==false){
  $('#nunfall').css("backgroundPosition", '0 0');
 }
 });
 
 $("#aleistungen").hover(function(){
$('#nleistungen').css("backgroundPosition","0 -49px");
 }, function(){if(link3==false){
  $('#nleistungen').css("backgroundPosition", '0 0');
 }
 });
 
 $("#alinks").hover(function(){
$('#nlinks').css("backgroundPosition","0 -47px");
 }, function(){if(link4==false){
  $('#nlinks').css("backgroundPosition", '0 0');
 }
 });
 
 $("#aold").hover(function(){
$('#nold').css("backgroundPosition","0 -48px");
 }, function(){if(link5==false){
  $('#nold').css("backgroundPosition", '0 0');
 }
 });
  $("#akontakt").hover(function(){
$('#nkontakt').css("backgroundPosition","0 -46px");
 }, function(){if(link6==false){
  $('#nkontakt').css("backgroundPosition", '0 0');
 }
 });
});