function isEmpty(inputValue){
	if (inputValue == null || inputValue == ""){
		return true
	}
	return false
}

function isEmail(inputValue){
	atChars = 0
	inputString = inputValue.toString();
	for (var i = 0; i < inputString.length; i++){
		var oneChar = inputString.charAt(i);
		if (oneChar == "@" && i != 0 && i < (inputString.length - 1)){
			atChars += 1;
		}
	}
	if (atChars == 1){
		return true
	}
	return false
}

function validate(form){

	if(isEmpty(form.emailAddress.value)){
		alert("Please enter your E-mail Address.");
		form.emailAddress.focus();
		return false
	}
	else if (!isEmail(form.emailAddress.value)){
		alert("You have entered an invalid email address. Please enter a valid email address, for example: 'yourUsername@yourAdddress.com'");
		form.emailAddress.focus();
		form.emailAddress.select();
		return false

	}
	else{
		return true
	}
}