// JavaScript General Functions Library

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 (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 validateRegisterFields()
{
	var ok = false;
	var f = document.registerForm;
	
	if(emailCheck(f.userName.value) && f.password.value != "" && f.password2.value != "" && f.fullName.value !="")
	{
		ok = true;
	} else {
		alert("Please supply all fields to register.");
		ok = false;
	}
	
	return ok;
}