// JavaScript Document

function checkFeedback(fullname, email, subject, message){
	
	if(is_empty(fullname, "Please fill in your name.")){
		return false;
	} else if(is_empty(email, "Please fill in the email.")){
		return false;
	} else if(/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(email.value) == false){
		alert("Please enter a correct email.");
		return false;
	} else if(subject.value == "NA"){
		alert("Please select the relevant subject.");
		return false;
	} else if(is_empty(message, "Please fill in the message box.")){
		return false;
	} else {
		return true;	
	}
}