function berechne()
{
var formular = document.eingabe;
if (formular.contactFormField_17[0].checked == true)
      {
       formular.contactFormField_23.value = (formular.contactFormField_19.value * 8.5) + (formular.contactFormField_20.value * 6.5)
      }
else
      {
       formular.contactFormField_23.value = (formular.contactFormField_19.value * 9.5) + (formular.contactFormField_20.value * 7.5)
      }//if
}//function