// validation code for refer.php 
// Copyright © 2001 by Apple Computer, Inc., All Rights Reserved.
//
// You may incorporate this Apple sample code into your own code
// without restriction. This Apple sample code has been provided "AS IS"
// and the responsibility for its operation is yours. You may redistribute
// this code, but you are not permitted to redistribute it as
// "Apple sample code" after having made changes.

function checkName(strng) {
var error = "";
if (strng == "") {
   error = "You didn't enter your Full Name.\n";
	}
 return error;
}
function checkUsername(strng) {
var error = "";
if (strng == "") {
   error = "You didn't enter a username.\n";
	}
 return error;
}
// EMAIL VALIDATION
function checkEmail(strng) {
var error="";
if (strng == "") {
   error = "You didn't enter a valid email address.\n";
}

    var emailFilter=/^.+@.+\..{2,3}$/;
    if (!(emailFilter.test(strng))) { 
       error = "Please enter a valid email address.\n";
    }
    else {
//test email for illegal characters
       var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]]/
         if (strng.match(illegalChars)) {
          error = "The email address contains illegal characters.\n";
       }
    }
return error;    
}