function isValidEmail(email, required) {
    if (required==undefined) {   
        required=true;
    }
    if (email==null) {
        if (required) {
            return false;
        }
        return true;
    }
    if (email.length==0) {  
        if (required) {
            return false;
        }
        return true;
    }
    if (! allValidChars(email)) { 
        return false;
    }
    if (email.indexOf("@") < 1) {
        return false;
    } else if (email.lastIndexOf(".") <= email.indexOf("@")) {  
        return false;
    } else if (email.indexOf("@") == email.length) {  
        return false;
    } else if (email.indexOf("..") >=0) { 
	return false;
    } else if (email.indexOf(".") == email.length) { 
	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;
}

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