function checkBox(oForm,sFieldName,sMsg) {
  var oField=oForm.elements[sFieldName];
  if(!oField)
    return false;
  if(oField.checked)
    return true;
  alert(sMsg);
  return false;
}

function checkUserRegister(oForm,sMsg1,sMsg2) {
  var bResult1=checkBox(oForm,'legal1',sMsg1);
  var bResult2=checkBox(oForm,'legal2',sMsg2);
  if(!bResult1||!bResult2)
    return false;
  return true;
}
function docRecalc() {
  if(document.recalc)
    document.recalc();
}