// JavaScript Document
function emailCheck (emailStr) { //Written by Sandeep V. Tamhankar (stamhankar@hotmail.com)
	var checkTLD=1;
	var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;
	var emailPat=/^(.+)@(.+)$/;
	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];

	for (i=0; i<user.length; i++) {
		if (user.charCodeAt(i)>127) {
			alert("Ths username contains invalid characters.");
			return false;
		}
	}

	for (i=0; i<domain.length; i++) {
		if (domain.charCodeAt(i)>127) {
			alert("Ths domain name contains invalid characters.");
			return false;
		}
	}
	
	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 atomPat=new RegExp("^" + atom + "$");
	var domArr=domain.split(".");
	var len=domArr.length;
	for (i=0;i<len;i++) {
		if (domArr[i].search(atomPat)==-1) {
			alert("The domain name does not seem to be valid.");
			return false;
   		}
	}

	if (checkTLD && domArr[domArr.length-1].length!=2 && domArr[domArr.length-1].search(knownDomsPat)==-1) {
		alert("The address must end in a well-known domain or two letter " + "country.");
		return false;
	}

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

	return true;
}

function validation(obj){
	var buttons = obj.cat;
	var myOption = -1;
	var i;
	for (i = buttons.length-1; i > -1; i--){
		if(buttons[i].checked){
			myOption = i;
			i = -1;
		}
	}
	if(myOption == -1){
		alert("You must select a category");
		return false;
	}
	if(obj.name.value == ""){
		alert("Please enter your name");
		obj.name.focus();
		return false;
	}
	if(obj.name.value.length < 2){
		alert("Please enter your full name");
		obj.name.focus();
		return false;
	}
	if(obj.email.value == ""){
		alert("Please enter your email address");
		obj.email.focus();
		return false;
	}
	if(emailCheck (obj.email.value) == false){
		obj.email.focus();
		return false;
	}
	if(buttons[0].checked){
		if(obj.school.value == ""){
			alert("Please enter the school you attend.");
			obj.school.focus();
			return false;
		}
		if(obj.houses.value == ""){
			alert("Please select your houses.");
			obj.houses.focus();
			return false;
		}
	}else if(buttons[1].checked){
		if(obj.houses.value == ""){
			alert("Please select your houses.");
			obj.houses.focus();
			return false;
		}
	}else if(buttons[2].checked){
		if(obj.school.value == ""){
			alert("Please enter the school you are affiliated with.");
			obj.school.focus();
			return false;
		}
	}else if(buttons[3].checked){
		if(obj.org.value == ""){
			alert("Please enter the organization you are affiliated with.");
			obj.org.focus();
			return false;
		}
	}
	var buttons1 = obj.spamq;
	var myOption1 = -1;
	var j;
	for (j = buttons1.length-1; j > -1; j--){
		if(buttons1[j].checked){
			myOption1 = j;
			j = -1;
		}
	}
	if(myOption1 == -1){
		alert("You must answer the anti-spam question.");
		return false;
	}
	if(buttons1[0].checked){
		alert("Try again!");
		return false;
	}

	return true;
}