function emailCheck (emailStr) {
var emailPat=/^(.+)@(.+)$/
var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]"
var validChars="\[^\\s" + specialChars + "\]"
var quotedUser="(\"[^\"]*\")"
var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/
var atom=validChars + '+'
var word="(" + atom + "|" + quotedUser + ")"
var userPat=new RegExp("^" + word + "(\\." + word + ")*$")
var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$")

if (emailStr == ""){
	return ("is required!")
	}
var matchArray=emailStr.match(emailPat);
if (matchArray==null) {
	return ("is incorrect.\nCheck @ and .'s")
}
var user=matchArray[1]
var domain=matchArray[2]
if (user.match(userPat)==null) {
    return ("is incorrect.\nCheck to the left of the @")
}
var IPArray=domain.match(ipDomainPat)
if (IPArray!=null) {
	  for (var i=1;i<=4;i++) {
	    if (IPArray[i]>255) {
		return ("is incorrect.\nMake sure your IP address contains numbers 255 and lower.")
	    }
    }
    return true
}

var domainArray=domain.match(domainPat)
if (domainArray==null) {
    return ("is incorrect.\nCheck the domain name")
}
var atomPat=new RegExp(atom,"g")
var domArr=domain.match(atomPat)
var len=domArr.length
if (domArr[domArr.length-1].length<2 || 
    domArr[domArr.length-1].length>3) {
   return ("is incorrect.\nThe address must end with .com or .co.uk for example.")
}
return ("is correct.")
}

function nameEval () {
	var realName = document.getElementById("realname")
	var nameStar = document.getElementById("nameStar")
	if (realName.value==""){
		nameStar.firstChild.nodeValue = "Your Name is required!"
		nameStar.className = "bad"
		}
	else {
		nameStar.firstChild.nodeValue = "Your Name is good!"
		nameStar.className = "good"
		}
	}
	
function emailEval () {
	var emailFrom = document.getElementById("emailFrom")
	var emailStar = document.getElementById("emailStar")
	var message= emailCheck(emailFrom.value)
		emailStar.firstChild.nodeValue = "Your Email Address " + message
		if (message == "is correct."){
		emailStar.className = "good"}
		else {
			emailStar.className = "bad"
			}
	}
	
function messageEval () {
	var messageField = document.getElementById("message")
	var messageStar = document.getElementById("messageStar")
	if (messageField.value==""){
		messageStar.firstChild.nodeValue = "Your Message is required!\n Don't you want to tell me something?"
		messageStar.className = "bad"
		}
	else {
		messageStar.firstChild.nodeValue = "Your Message is good!"
		messageStar.className = "good"
		}
	}
function allEval (){
	nameEval()
	emailEval()
	messageEval()
	if (document.getElementById("messageStar").className=="bad" || document.getElementById("emailStar").className=="bad" || document.getElementById("nameStar").className=="bad") {
		var error =confirm("There are errors with the data you entered. \n\n To submit the form anyway press OK \n To go back and fix the errors in red press CANCEL")
		return error
		}
else {
	return true
	}
}