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

var domainArray=domain.match(domainPat)
	if (domainArray==null) {
    	alert("Your email is incorrect.\nCheck the domain name")
		return 1
	}

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) {
  		alert("Your email is incorrect.\nThe address must end with .com or .co.uk for example.")
   		return 1
		}
	else {
		return 0
		}
	}

function visitorEval(error) {
	var fullName = document.getElementById("visitor")
	if (fullName.value==""){
		alert("Your Name is required!")
		return 1
		}
		return 0
	}
	
function emailEval (error) {
	var emailFrom = document.getElementById("email")
	return emailCheck(emailFrom.value)
	}
	
function passEval () {
	var passField = document.getElementById("password")
	if (passField.value==""){
		alert("A password is required!")
		return 1
		}
		return 0
	}
	
function hintEval () {
	var hintField = document.getElementById("hint")
	if (hintField.value==""){
		alert("A password hint is required!")
		return 1
		}
		return 0
	}
	
function allEval (){
	var error=0
	error = visitorEval(error)
	
	if (error == 0) {error = emailEval()}
	if (error == 0) {error = passEval()}
	if (error == 0) {error = hintEval()}
	
	if (error != 0)
	{return false}
	if (error == 0) {return true}

}