// Javascript Document

function formValidator(){
	var firstname = document.getElementById('firstname');
	var lastname = document.getElementById('lastname');
	var email = document.getElementById('email');
	
	if(isAlphabet(firstname,"Please enter your first name")){
		if(isAlphabet(lastname,"Please enter your last name")){
			if(emailValidator(email,"Please enter a valid email address")){
			return true;
			}
		}
	}
	
	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;
	}
}
	
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;
	}
}