function doRegExp(sRegExp,sValue) {
  var re = new RegExp(sRegExp);
  return re.test(sValue);
}


function checkUserID(s){
var result = '';
if (s.length < 6)
	result = "The User name must be at least 6 characters. "
	else	if (s.length > 16)
				result = "The User name cannot be longer than 6 characters. ";
if (result == '')   
	if (!doRegExp("(?!([a-zA-Z0-9]*[\-\._]){2,})^([a-zA-Z][_a-zA-Z0-9\-\.]{4,14}[a-zA-Z0-9])$",s))
		result = "The User name contains invalid characters or does not start with a letter. ";
return result;
}

function checkPassword(s){
var result = '';
if (s.length < 8)
	result = "The Password must be at least 8 characters. "
	else	if (s.length > 16)
				result = "The Password cannot be longer than 6 characters. ";
if (result == '')   
	if (!doRegExp("(?=.*[a-z])(?=.*[A-Z])(?=.*[0-9])([_a-zA-Z0-9\-\.]{8,16})",s))
		result = "The Password contains invalid characters or does not contain the required character types. ";
return result;

}

function checkEmail(s){
if (!doRegExp("^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$",s))
	return "Invalid email address. "
	else
		return "";
}

function checkSSN(s){
if (!doRegExp("^([0-9]{3}-[0-9]{2}-[0-9]{4})$|^([0-9]{9})$",s))
	return "Invalid Social Security Number. "
	else
		return "";
}

function checkZip(s){
if (!doRegExp("^[0-9]{5}(([\-])?[0-9]{4}){0,1}$",s))
	return "Invalid zip code. "
	else
		return "";

}


function iOS() {

  var iDevices = [
    'iPad Simulator',
    'iPhone Simulator',
    'iPod Simulator',
    'iPad',
    'iPhone',
    'iPod'
  ];

  if (!!navigator.platform) {
    while (iDevices.length) {
      if (navigator.platform === iDevices.pop()){ return true; }
    }
  }

  return false;
}