function isValidEmail(email, required) {
    if (required==undefined) {   // if not specified, assume it's required
        required=true;
    }
    if (email==null) {
        if (required) {
            return false;
        }
        return true;
    }
    if (email.length==0) {  
        if (required) {
            return false;
        }
        return true;
    }
    if (! allValidChars(email)) {  // check to make sure all characters are valid
        return false;
    }
    if (email.indexOf("@") < 1) { //  must contain @, and it must not be the first character
        return false;
    } else if (email.lastIndexOf(".") <= email.indexOf("@")) {  // last dot must be after the @
        return false;
    } else if (email.indexOf("@") == email.length) {  // @ must not be the last character
        return false;
    } else if (email.indexOf("..") >=0) { // two periods in a row is not valid
	return false;
    } else if (email.indexOf(".") == email.length) {  // . must not be the last character
	return false;
    }
    return true;
}

function allValidChars(email) {
  var parsed = true;
  var validchars = "abcdefghijklmnopqrstuvwxyz0123456789@.-_";
  for (var i=0; i < email.length; i++) {
    var letter = email.charAt(i).toLowerCase();
    if (validchars.indexOf(letter) != -1)
      continue;
    parsed = false;
    break;
  }
  return parsed;
}


function allValidNumbers(number) {
  var parsed = true;
  var validchars = "0123456789 ";
  for (var i=0; i < number.length; i++) {
    var letter = number.charAt(i).toLowerCase();
    if (validchars.indexOf(letter) != -1)
      continue;
    parsed = false;
    break;
  }
  return parsed;
}



function firstname(firstName) {
	if (firstName==null) {
        return false;
    }
    else if (firstName.length==0) {  
        return false;
    }
	else
	{
		return true;
	}

}


function lastname(lastName) {
	if (lastName==null) {
        return false;
    }
    else if (lastName.length<2) {  
        return false;
    }
    else if (! allValidNumbers(lastName)) {
        return false;
    }
	else
	{
		return true;
	}
}

function schoolname(schoolName) {
	if (schoolName==0) {
        return false;
    }
	else
	{
		return true;
	}

}

function mobile(Mobile) {
	if (Mobile==null) {
        return false;
    }
    else if (Mobile.length<=5) {  
        return false;
    }
    else if (! allValidNumbers(Mobile)) {
        return false;
    }
	else
	{
		return true;
	}

}

function residence(Residence) {
	if (Residence==null) {
        return false;
    }
    else if (Residence.length<=5) {  
        return false;
    }
    else if (! allValidNumbers(Residence)) {
        return false;
    }
	else
	{
		return true;
	}

}

function address(Address) {
	if (Address==null) {
        return false;
    }
    else if (Address.length==0) {  
        return false;
    }
	else
	{
		return true;
	}

}

function term(Term) {
	if (Term==false) {
        return false;
    }
	else
	{
		return true;
	}

}