function regChk(fom)
{
  fom.email.value = fom.email.value.trim();
  fom.email2.value = fom.email2.value.trim();

  var chkitem;

  chkitem = check_null(fom.email.value) + check_char(fom.email.value) + check_mail(fom.email.value);
  if( chkitem != "" )
  {
    alert( "\"電子郵件\"" + chkitem );
    fom.email.focus();
    return false;
  }

  chkitem = check_char(fom.email2.value) + check_mail(fom.email2.value);
  if( chkitem != "" )
  {
    alert( "\"備用郵件\"" + chkitem );
    fom.email2.focus();
    return false;
  }

  fom.op.value="ins";
  fom.target="ifrm";
  fom.submit();
}