function CheckForBlankFields() {
  isValid = true;
  if (document.req_pchs.Title.value == "") {
    isValid = false;
    alert("The title of the book was not entered.  Please enter it now.");
    document.req_pchs.Title.focus();
  }
  if (document.req_pchs.Book_Subject.value == "") {
    isValid = false;
    alert("The subject of the book was not entered.  Please enter now.");
    document.req_pchs.Book_Subject.focus();
  }
  if (document.req_pchs.Name.value == "") {
    isValid = false;
    alert("Your name was not entered.  Please enter one now.");
    document.req_pchs.Name.focus();
  }
  if (document.req_pchs.Email.value == "") {
    isValid = false;
    alert("Your email was not entered.  Please enter one now.");
    document.req_pchs.Email.focus();
  }
  if (document.req_pchs.Mailstop.value == "") {
    isValid = false;
    alert("Your box number or mailstop was not entered.  Please enter one now.");
    document.req_pchs.Mailstop.focus();
  }
  if (isValid) {
    document.req_pchs.submit()
  }
}