function setAccount() {
  var i, c, el, elName, mask, lastParm, r;
  c = 0;
  mask = 0;
  for (i=0; i<document.f.length; i++) {
    el = document.f.elements[i];
    elName = el.name;
    if ( elName.substring(0, 1) == 'x' ) {
      if ( el.checked ) {
        c++;
        lastParm = elName.substring(1);
        mask += ( el.value - 0 );
      }
    }
  }
  if ( c == 0 ) {
    alert('You must check at least one account.');
    r = false;
  } else {
    if ( c == 1 ) {
      document.f.acct.value = lastParm;
    } else {
      document.f.acct.value = mask;
    }
    r = true;
  }
  return r;
}