function checkFields(form) {
	missinginfo = "";
	if (form.full_name.value == "") {
		missinginfo += "\n     - name";
	}
	if(form.email.value == "") {
		missinginfo += "\n     - email address";
	}
	if(form.attempt.value == "") {
		missinginfo += "\n     - security text code";
	}

	if (missinginfo != "") {
		missinginfo ="_____________________________\n" +
		"Please fill in your:\n" +
		missinginfo + "\n_____________________________" +
		"\n and submit again!";
		alert(missinginfo);
		return false;
	}
	else {
		return emailCheck(form.email.value);
	}
}

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 +")*$")

var matchArray=emailStr.match(emailPat)
if (matchArray==null) {
	alert("Email address seems incorrect (check @ and .'s)")
	return false
}
var user=matchArray[1]
var domain=matchArray[2]

if (user.match(userPat)==null) {
	 alert("The username doesn't seem to be valid.")
	 return false
}

var IPArray=domain.match(ipDomainPat)
if (IPArray!=null) {
	  for (var i=1;i<=4;i++) {
		 if (IPArray[i]>255) {
			  alert("Destination IP address is invalid!")
		return false
		 }
	 }

	 return true
}

var domainArray=domain.match(domainPat)
if (domainArray==null) {
	alert("The domain name doesn't seem to be valid.")
	 return false
}
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("The address must end in a three-letter domain, or two letter country.")
	return false
}

if (len<2) {
	var errStr="This address is missing a hostname!"
	alert(errStr)
	return false
}
return true;
}