function password(npt) {
         checking = 'no';
         if(document.getElementById(npt).type == 'password') {
                 document.getElementById(npt).type = 'text';
                 document.getElementById('show').value = 'Passwort verstecken';
                 checking = 'on';
         }

         if(document.getElementById(npt).type == 'text') {
                 if(checking != 'on') {
                         document.getElementById(npt).type = 'password';
                         document.getElementById('show').value = 'Passwort anzeigen';
                 }
         }
}