function checkReg() {
  var message = "";
  if (document.reg_form.firstname.value.length == 0) {
    message = message + "First name is required.\n";
  }
  if (document.reg_form.lastname.value.length == 0) {
    message = message + "Last name is required.\n";
  }
  if (document.reg_form.reg_email.value.length == 0) {
    message = message + "Email is required.\n";
  }
  if (document.reg_form.phone.value.length == 0) {
    message = message + "Phone is required.\n";
  }
  if (document.reg_form.month.value == 0) {
    message = message + "Month of birthdate is required.\n";
  }
  if (document.reg_form.day.value == 0) {
    message = message + "Day of birthdate is required.\n";
  }
  if (document.reg_form.year.value == 0) {
    message = message + "Year of birthdate is required.\n";
  }
  if (document.reg_form.age.value == 0) {
    message = message + "Age is required.\n";
  }
  if (document.reg_form.gender.value == 0) {
    message = message + "Gender is required.\n";
  }
  if (document.reg_form.occupation.value == 0) {
    message = message + "Occupation is required.\n";
  }
  if (document.reg_form.education.value == 0) {
    message = message + "Education is required.\n";
  }
  if (document.reg_form.income.value == 0) {
    message = message + "Income is required.\n";
  }

  if (message.length > 0){
  alert(message);
  return false;
  } else {
  return true;
  }
}

function checkLog() {
  if (document.log_form.log_email.value.length == 0) {
    alert ("Email is required.");
    return false;
  }
    return true;
}

function emailCheck () {
  for (var x=1; x<=5; x++)
  {
    var field = "referral" + x;
    var emailStr = eval ("document.main_form." + field + ".value");
    if (emailStr)
    {
      var emailPat=/^(.+)@(.+)$/
      var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]"
      var validChars="\[^\\s" + specialChars + "\]"
      var quotedUser="(\"[^\"]*\")"
      var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/
      var atom=validChars + '+'
      var word="(" + atom + "|" + quotedUser + ")"
      var userPat=new RegExp("^" + word + "(\\." + word + ")*$")
      var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$")
      var matchArray=emailStr.match(emailPat)

      if (matchArray==null) {
        alert("Email address " + x + " seems incorrect (check @ and .'s)")
        return false
      }

      var user=matchArray[1]
      var domain=matchArray[2]
        
      if (user.match(userPat)==null) {
      // user is not valid
        alert("The username in email address " + x + " doesn't seem to be valid.")
        return false
      }

      var IPArray=domain.match(ipDomainPat)
      if (IPArray!=null) {
      // this is an IP address
        for (var i=1;i<=4;i++) {
          if (IPArray[i]>255) {
            alert("Destination IP in address " + x + " is invalid!")
            return false
          }
        }
        return true
      }

      var domainArray=domain.match(domainPat)
      if (domainArray==null) {
        alert("The domain name in address " + x + " doesn't seem to be valid.")
        return false
      }

      var atomPat=new RegExp(atom,"g")
      var domArr=domain.match(atomPat)
      var len=domArr.length
      if (domArr[domArr.length-1].length<2 || 
        domArr[domArr.length-1].length>3) {
        alert("Address " + x + " must end in a three-letter domain, or two letter country.")
        return false
      }
        
      if (len<2) {
        var errStr="Address " + x + " is missing a hostname!"
        alert(errStr)
        return false
      }
    }
  }
  return true;
}

function select_Country(form, radio_num) {
  form.country_no[radio_num].checked = true;

  if (radio_num != 1)
  {
    form.province.options.selectedIndex = 0;
  }
  if (radio_num != 0)
  {
    form.state.options.selectedIndex = 0;
  }
  if (radio_num != 2)
  {
    form.others.options.selectedIndex = 0;
  }
}

function set_Others(form, radio_num, others_select) {
  var value = form.others[form.others.options.selectedIndex].value;
  form.country_no[radio_num].value = value;
}