function select_payment(type) {
 
 var auswahlfeld = document.getElementById('payment');
 var formularelv = document.getElementById('elv');
 var formularpp = document.getElementById('paypal');
 var formularprepaid = document.getElementById('prepaid');

 if (auswahlfeld.value=='elv') {
  formularelv.style.display='block';
  formularpp.style.display='none';
  formularprepaid.style.display='none';  
 }
 if (auswahlfeld.value=='paypal') {
  formularelv.style.display='none';
  formularpp.style.display='block';
  formularprepaid.style.display='none';  
 }
 if (auswahlfeld.value=='prepaid') {
  formularelv.style.display='none';
  formularpp.style.display='none';
  formularprepaid.style.display='block';  

 }


}