// JavaScript Document
function formValidator() { 
		var fullName = document.getElementById('fullName');
		//var lastname = document.getElementById('lastname');
		var email = document.getElementById('email');
		//var telephone = document.getElementById('telephone');
		var message = document.getElementById('message');
		// check each input in the order that appears in the form!
		
		if(!isAlphabet(fullName, "Please enter your full name beginning with a capital letter."))return false;
		//if(!isAlphabet(lastname, "Please enter your last name beginning with a capital letter."))return false;
		if(!emailValidator(email, "Please enter a valid email address."))return false;
		//if(!(isNumeric(telephone,"Invalid telephone.") && lengthRestriction(telephone, 8 , 10 )))return false;
		if(!isTextarea(message, "Please enter your message."))return false;
		return true;
}
function isEmpty(elem, helperMsg){
	if(elem.value.length == 0){
		alert(helperMsg);
		elem.focus(); // set the focus to this input
		return true;
	}
	return false;
}

function isNumeric(elem, helperMsg){
	var numericExpression = /^[0-9]+$/;
	if(elem.value.match(numericExpression)){
		return true;
	}else{
		alert(helperMsg);
		elem.focus();
		return false;
	}
}

function isAlphabet(elem, helperMsg){
	var alphaExp =/^[A-Z][a-zA-Z]+\s[A-Z][a-zA-Z]{1,40}$/;
	if(elem.value.match(alphaExp)){
		return true;
	}else{
		alert(helperMsg);
		elem.focus();
		return false;
	}
}

function lengthRestriction(elem, min, max){
	var uInput = elem.value;
	if(uInput.length >= min && uInput.length <= max){
		return true;
	}else{
		alert("Please enter between " +min+ " and " +max+ " digits");
		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;
	}
}

function isTextarea(elem, helperMsg){
	var uInput = elem.value;
	if(uInput.length >= 15 ){
		return true;
	}else{
		alert(helperMsg);
		elem.focus(); // set the focus to this input
		return false;
	}
}