/**
* checkDate - checks is all selects have been changed, if they have it checks to see if
* a user is 17+, if they are it sets a cookie, else displays error message
*/
function checkAge(userYear, userMonth, userDay){

	//get users dob
	var dateOfBirth = 	new Date (userYear, (userMonth - 1), userDay);
		
	// find 18 years ago
	var todayDate = new Date(); 
	var eightteenYearsAgo = new Date(todayDate.getFullYear()-18, todayDate.getMonth(), todayDate.getDate(),0,0,0);
	
	//check to see if over 16
	if(dateOfBirth <= eightteenYearsAgo){
		// Success
		return true;
	}
	else {
		// Failure
		document.getElementById('requestArticles').innerHTML = '<h2 class="error">Sorry. Unfortunately, you are too young to join the FIFA Interactive World Cup 2008</h2>';
		return false;
	}
	
}
/**
* validateForm - checks to see if all the required fields are filed out, email address is correct
* and the user is over 17
*/
function validateForm(thisform){
	var hasError = new Array(3);
	hasError[0] = validateRequired(thisform.email_addr);
	hasError[1] = validateRequired(thisform.ageSelector_month);
	hasError[2] = validateRequired(thisform.ageSelector_day);
	hasError[3] = validateRequired(thisform.ageSelector_year);
	
	
	// make sure all required fields are filed out
	for(var i = 0; i < hasError.length; i++){
		if(!hasError[i]){
			return false;
		}
	}
	
	//checkAge
	if(checkAge(thisform.ageSelector_year.value, thisform.ageSelector_month.value, thisform.ageSelector_day.value)){
		return true;
	} else {
		return false;
	}
	
	
}
/**
* validateRequired - checks to see if a field was filled out
*/
function validateRequired(curEl){

	if (curEl.value == null || curEl.value == ""){
		curEl.className = 'errorInput';
		return false;
	}
	else {
		if(curEl.id == 'email_addr') {
			// make sure email is valid
			var emailRegex = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
			if(!emailRegex.test(curEl.value)){
				curEl.className = 'errorInput';
				return false;
			}		
		}
		curEl.className = '';
		return true;
	}
}