// JavaScript Document
// Declaring required variables
var digits = "0123456789";
// non-digit characters which are allowed in phone numbers
var phoneNumberDelimiters = "()- ";
// characters which are allowed in international phone numbers
// (a leading + is OK)
var validWorldPhoneChars = phoneNumberDelimiters + "+";
// Minimum no of digits in an international phone no.
var minDigitsInIPhoneNumber = 8;

function isInteger(s)
{
   var i;
   for (i = 0; i < s.length; i++)
   {   
      // Check that current character is number.
      var c = s.charAt(i);
      if (((c < "0") || (c > "9"))) return false;
   }
   // All characters are numbers.
   return true;
}

function stripCharsInBag(s, bag)
{
   var i;
   var returnString = "";
   // Search through string's characters one by one.
   // If character is not in bag, append to returnString.
   for (i = 0; i < s.length; i++)
   {   
      // Check that current character isn't whitespace.
      var c = s.charAt(i);
      if (bag.indexOf(c) == -1) returnString += c;
   }
   return returnString;
}

function checkInternationalPhone(strPhone)
{
   s=stripCharsInBag(strPhone,validWorldPhoneChars);
   return (isInteger(s) && s.length >= minDigitsInIPhoneNumber);
}

function validEmail(email)
{
   invalidChars = " /:,;"

   if (email == "")
      return false

   for (i=0; i<invalidChars.length; i++)
   {
      badChar = invalidChars.charAt(i)

      if (email.indexOf(badChar,0)>-1)
         return false
   }

   atPos = email.indexOf("@",1)

   if (atPos == -1)
      return false

   if (email.indexOf("@",atPos+1) != -1)
      return false

   periodPos = email.indexOf(".",atPos)

   if (periodPos == -1)
      return false

   if (periodPos+3 > email.length)
      return false

   return true
}


function validUsername(username)
{
   invalidChars = "/:,;='&^"

   if (username == "")
      return false

   for (i=0; i<invalidChars.length; i++)
   {
      badChar = invalidChars.charAt(i)

      if (username.indexOf(badChar,0)>-1)
         return false
   }

   return true
}

function submitIt(reg)
{
   if (reg.username.value == "")
   {
      alert("Please enter your username.")
	  return false
   }

   if (!validUsername(reg.username.value))
   {
      alert("Invalid username. Please enter your username again.")
	  return false
   }

   if (reg.password.value == "")
   {
      alert("Please enter your password.")
	  reg.password.focus()
	  return false
   }

   if (reg.repassword.value == "")
   {
      alert("Please re-enter your password.")
	  reg.repassword.focus()
	  return false
   }
   
   if (reg.password.value != reg.repassword.value)
   {
      alert("Passwords did not match.")
	  reg.password.focus()
      return false
   }

   if (reg.firstname.value == "")
   {
      alert("You must enter your first name.")
	  return false
   }
   
   if (reg.lastname.value == "")
   {
      alert("You must enter your last name.")
	  return false
   }

   if (reg.company.value == "")
   {
      alert("Please enter your company name.")
      return false
   }

   if (reg.industry.value == "")
   {
      alert("Please enter which industry you work at.")
      return false
   }

   if (reg.street1.value == "")
   {
      alert("You must enter the street address 1.")
      return false
   }

   if (reg.suburb.value == "")
   {
      alert("You must enter the suburb.")
      return false
   }

   stateChoice = reg.state.selectedIndex;
   if (reg.state.options[stateChoice].value == "")
   {
      alert ("You must select the state.");
      return false;
   }

   if (reg.state.options[stateChoice].value == "Others")
   {
      if (reg.state2.value == "")
      {
         alert("You must enter the state.")
         return false
      }
   }

   if (reg.postcode.value == "")
   {
      alert("You must enter the postcode.")
      return false
   }

   if (reg.country.value == "")
   {
      alert("You must enter the country.")
      return false
   }

   if (reg.phone.value == "")
   {
      alert("You must enter your phone number.")
      return false
   }

   if (reg.phone.value != "")
   {
      if (!checkInternationalPhone(reg.phone.value))
      {
         alert("The phone number that you have entered is not valid. Please re-enter the phone number.")
	     return false
      }
   }

   if (reg.fax.value != "")
   {
      if (!checkInternationalPhone(reg.fax.value))
      {
         alert("The fax number that you have entered is not valid. Please re-enter the fax number.")
	     return false
      }
   }

   if (reg.email.value == "")
   {
      alert ("You must enter the email address.")
      return false
   }
   
   if (reg.email.value != "")
   {
      if (!validEmail(reg.email.value))
      {
         alert("The email address that you have entered is not valid. Please re-enter the email address.")
         return false
      }
   }

   if (reg.reemail.value == "")
   {
      alert("Please re-enter your email.")
	  reg.reemail.focus()
	  return false
   }
   
   if (reg.email.value != reg.reemail.value)
   {
      alert("Email did not match")
	  reg.email.focus()
	  reg.email.select()
	  reg.reemail.focus()
	  reg.reemail.select()
      return false
   }
    
   if (reg.experience.value == "")
   {
      alert ("You must brief description of your experience / qualifications.")
      return false
   }

   return true
}