// JavaScript Document

function emailcheck (emailStr) {

	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 (example@email.com)");
	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 checkall()
{
	//alert("test");
	var fname=document.getElementById('fname').value;
	var lname=document.getElementById('lname').value;
	var email=document.getElementById('email').value;
	var message=document.getElementById('message').value;
	if(fname == "" || fname =="first name")
	{
		window.alert("First name required.");
		return false;
	}
	else
	{
		if(lname == "" || lname =="last name")
		{
			window.alert("Last name required.");
			return false;
		}
		else
		{
			if(email == "" || email =="e-mail")
			{
				window.alert("Email address required.");
				return false;
			}
			else
			{
				if (emailcheck(email)==false)
				{
					window.alert("Invalid e-mail address!");
					return false;
			  	}
				else
				{
					if(message == "" || message =="message")
					{
						window.alert("Message required.");
						return false;
					}
					else
					{
						return true;
					}
				}
			}
		}
	}
}