<!-- Original:  Cyanide_7 (leo7278@hotmail.com) -->
<!-- Web Site:  http://members.xoom.com/cyanide_7 -->

<!-- This script and many more are available free online at -->
<!-- The JavaScript Source!! http://javascript.internet.com -->

var isNN = (navigator.appName.indexOf("Netscape")!=-1);

function autoTab(input,len, e) {
var keyCode = (isNN) ? e.which : e.keyCode; 
var filter = (isNN) ? [0,8,9] : [0,8,9,16,17,18,37,38,39,40,46];
if(input.value.length >= len && !containsElement(filter,keyCode)) {
input.value = input.value.slice(0, len);
input.form[(getIndex(input)+1) % input.form.length].focus();
}

function containsElement(arr, ele) {
var found = false, index = 0;
while(!found && index < arr.length)
if(arr[index] == ele)
found = true;
else
index++;
return found;
}

function getIndex(input) {
var index = -1, i = 0, found = false;
while (i < input.form.length && index == -1)
if (input.form[i] == input)index = i;
else i++;
return index;
}
return true;
}

function emailCheck (emailStr,emailType) {

	if (emailStr.length == 0) {
	
		return "\n" + emailType + " Email is required";
	
	}

	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) {
		return "\n" + emailType + " Email address seems incorrect (check @ and .'s)";
	}

	var user=matchArray[1]
	var domain=matchArray[2]

	if (user.match(userPat)==null) {
		return "\n" + emailType + " Email username doesn't seem to be valid.";
	}

	var IPArray=domain.match(ipDomainPat);

	if (IPArray!=null) {
		for (var i=1;i<=4;i++){
			if (IPArray[i]>255) {
				return "\n" + emailType + " Email Destination IP address is invalid.";
			}
		}
	}

	var domainArray=domain.match(domainPat)

	if (domainArray==null) {
		return "\n" + emailType + " Email domain name doesn't seem to be valid.";
	}

	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 "\n" + emailType + " Email address must end in a three-letter domain, or two letter country.";
	}

	if (len<2) {
		return "\n" + emailType + " Email address is missing a hostname.";
	}

	return "";
}