function SubmitForm(formObj) {

emailAddress = formObj.emailAddress.value;
 

 if (emailAddress == "") {
  alert("Please enter your e-mail address.");
  formObj.emailAddress.focus();
  return false;
 }

 if (emailAddress != "") {
  linkPos = emailAddress.indexOf("@");
  emailAddressLen = emailAddress.length;

  if (linkPos == -1) {
   alert("You have not given us a valid e-mail address");
   formObj.emailAddress.focus();
   return false;
  }
  if ((emailAddressLen - linkPos) < 4) {
   alert("You have not given us a valid e-mail address");
   formObj.emailAddress.focus();
   return false;
  }
  if (emailAddress.indexOf(".@") != -1) {
   alert("You have not given us a valid e-mail address");
   formObj.emailAddress.focus();
   return false;
  }
  if (emailAddress.indexOf("@.") != -1) {
   alert("You have not given us a valid e-mail address");
   formObj.emailAddress.focus();
   return false;
  }
 }

 return true;
}