// JavaScript Document

function checkNewsletter()
{
	switch (false)
	{
		case (checkBlankInputs('Email#email address')):
		return false;
		break;
		
		case (validateEmail(document.theForm.Email.value, 1, 'Invalid Email')):
		return false;
		break;
	}
	
	document.theForm.Submit.disabled = true;
	document.theForm.submit();
}

function checkLogin()
{
	switch (false)
	{
		case (checkBlankInputs('username#email address', 'password#password')):
		return false;
		break;
		
		case (document.theForm.username.value.length >= 4):
		alert("Your username must be at least 4 characters");
		return false;
		break;
	}
	
	document.theForm.submit();
}

///--- CHECK FORM FIELDS ---//
function checkBlankInputs()
{
	var inputsPassed = 0;

	//CHECKS FOR EMPTY INPUTS
	for(i = 0; i < arguments.length; i++)
	{
		var theFormInfo = arguments[i].split("#");
		
		if(eval("document.theForm." + theFormInfo[0] + ".value") == "")
		{
			if(theFormInfo[1] == "")
			{
				theFormInfo[1] = theFormInfo[0];
			}
			alert("Please enter a valid " + theFormInfo[1]);
			i = arguments.length;
		}
		
		else
		{
			inputsPassed++;
		}
	}
	
	//RETURN ACCCORDING TO OUTCOME
	if(inputsPassed == arguments.length)
	{
		return true;
	}
	else
	{
		return false;
	}
}

//VALIDATES EMAIL
function validateEmail(addr,man,db)
{
	if (addr == '' && man) {
		if (db) alert('email address is mandatory');
		return false;
	}
	var invalidChars = '\/\'\\ ";:?!()[]\{\}^|';
	for (i=0; i<invalidChars.length; i++) {
		if (addr.indexOf(invalidChars.charAt(i),0) > -1) {
			if (db) alert('Email address contains invalid characters');
			return false;
		}
	}
	for (i=0; i<addr.length; i++) {
		if (addr.charCodeAt(i)>127) {
			if (db) alert("Email address contains non ascii characters.");
			return false;
		}
	}
	
	var atPos = addr.indexOf('@',0);
	if (atPos == -1) {
		if (db) alert('Email address must contain an @');
		return false;
	}
	if (atPos == 0) {
		if (db) alert('Email address must not start with @');
		return false;
	}
	if (addr.indexOf('@', atPos + 1) > - 1) {
		if (db) alert('Email address must contain only one @');
		return false;
	}
	if (addr.indexOf('.', atPos) == -1) {
		if (db) alert('Email address must contain a period in the domain name');
		return false;
	}
	if (addr.indexOf('@.',0) != -1) {
		if (db) alert('Period must not immediately follow @ in email address');
		return false;
	}
	if (addr.indexOf('.@',0) != -1){
		if (db) alert('Period must not immediately precede @ in email address');
		return false;
	}
	if (addr.indexOf('..',0) != -1) {
		if (db) alert('Two periods must not be adjacent in email address');
		return false;
	}
	var suffix = addr.substring(addr.lastIndexOf('.')+1);
	if (suffix.length != 2 && suffix != 'com' && suffix != 'net' && suffix != 'org' && suffix != 'edu' && suffix != 'int' && suffix != 'mil' && suffix != 'gov' & suffix != 'arpa' && suffix != 'biz' && suffix != 'aero' && suffix != 'name' && suffix != 'coop' && suffix != 'info' && suffix != 'pro' && suffix != 'museum') {
		if (db) alert('Invalid primary domain in email address');
		return false;
	}
	return true;
}

//--- OPEN AND RESIZE WINDOW ---//
function openWindow(websiteAddress, newWindowName, desiredWidth, desiredHeight)
{
	var height = window.screen.availHeight;
	var width = window.screen.availWidth;
	var leftPoint = parseInt(width / 2) - parseInt(desiredWidth / 2);
	var topPoint = parseInt(height / 2) - parseInt(desiredHeight / 2);
	
	windowOptions = "width=" + desiredWidth + ", height=" + desiredHeight + ", " + "menubar=no, status=no, location=no, toolbar=no, scrollbars=yes, resizable=yes, top=" + topPoint + ", left=" + leftPoint;
	window.open(websiteAddress, newWindowName, windowOptions);
}