function nvalidate(){
	var email = document.getElementById('email');
	var firstname = document.getElementById('firstname');
	var lastname = document.getElementById('lastname');
if(emailValidator(email, "Please enter a valid email address")){
   if(isAlphabet(firstname, "Please enter your firstname")){
		if(isAlphabet(lastname, "Please enter your lastname")){
							return true;
	}
  }
}	
	return false;
	
}
function isEmpty(elem, helperMsg){
	if(elem.value.length == 0){
		alert(helperMsg);
		elem.focus();
		return true;
	}
	return false;
}
function emailValidator(elem, helperMsg){
	var emailExp = /^[\w\-\.\+]+\@[a-zA-Z0-9\.\-]+\.[a-zA-z0-9]{2,4}$/;
	if(elem.value.match(emailExp)){
		return true;
	}else{
		alert(helperMsg);
		elem.focus();
		return false;
	}
}
function isAlphabet(elem, helperMsg){
	var alphaExp = /^[a-zA-Z]+$/;
	if(elem.value.match(alphaExp)){
		return true;
	}else{
		alert(helperMsg);
		elem.focus();
		return false;
	}
}